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Home Page

What can I do with this website?

Interactive 3D animations and structures, with supporting information for some important topics covered during an undergraduate chemistry degree.

Is vChem3D still an active project?

Yes, new subjects and examples are regularly added to this site.
Visit the History page

These pages are essentially based upon the Jmol application, and its JSmol variant, developped for websites.

You can play on this first page by searching molecules on the PubChem or RSCB servers.

By clicking on the appropriate parts of the scheme and rotating the structures in 3D, you can explore the geometry of a molecule.
Use your scroll wheel to enlarge and shrink the models, right clicking the mouse (Control-click MacOS) over the JSmol screen will give additional options and features.
To navigate your way to the required page, simply use the side-bar on the left.
According to the page, additional buttons are available and perform the labelled features.

Any Question or Suggestion?

Please Formulate it (kindly) to the author

Optimized for a 16:9 1600x900 resolution

Mesure d'audience ROI statistique webanalytics par

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Home Page Interactive 3D animations and structures, with supporting information for some important topics covered during an undergraduate chemistry degree. Yes, new subjects and examples are regularly added to this site. Visit the History page These pages are essentially based upon the Jmol application, and its JSmol variant, developped for websites.

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Molecular modelling

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Home Page

What can I do with this website?

Interactive 3D animations and structures, with supporting information for some important topics covered during an undergraduate chemistry degree.

Is vChem3D still an active project?

Yes, new subjects and examples are regularly added to this site.
Visit the History page

These pages are essentially based upon the Jmol application, and its JSmol variant, developped for websites.

You can play on this first page by searching molecules on the PubChem or RSCB servers.

By clicking on the appropriate parts of the scheme and rotating the structures in 3D, you can explore the geometry of a molecule.
Use your scroll wheel to enlarge and shrink the models, right clicking the mouse (Control-click MacOS) over the JSmol screen will give additional options and features.
To navigate your way to the required page, simply use the side-bar on the left.
According to the page, additional buttons are available and perform the labelled features.

Any Question or Suggestion?

Please Formulate it (kindly) to the author

Optimized for a 16:9 1600x900 resolution

Mesure d'audience ROI statistique webanalytics par

# data[].attributes.attachment_link.description
Home Page Interactive 3D animations and structures, with supporting information for some important topics covered during an undergraduate chemistry degree. Yes, new subjects and examples are regularly added to this site. Visit the History page These pages are essentially based upon the Jmol application, and its JSmol variant, developped for websites.

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national aeronautics and space administration

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Explore a real-time visualization of NASA's Earth-orbiting satellites and the data they collect about our planet's vital signs, including sea level height, global temperature and atmospheric carbon dioxide.

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national aeronautics and space administration

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Interactives - Climate Change: Vital Signs of the Planet

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Vital Signs of the Planet: Global Climate Change and Global Warming. Current news and data streams about global warming and climate change from NASA.

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Globe - Natural Science - Science - Paper Craft - Canon Creative Park

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Canon Inc. provides a wealth of free download materials on this site.The site is full of interesting content, like Paper Craft and Scrapbook, so you're sure to find something you like. Have fun printing out on your Canon Inkjet printer.

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Sun's Position Over Earth
(to update, reload page)
Courtesy: Fourmilab Switzerland

View Earth's Night Half
Day, Night & the Analemma
Earth Tilt, Sunrise & Sunset
No Sunlight on Entire Earth
Six Current Views of Earth Current Earth Weather

"PLANET OF LIFE!" Earth, the cradle of humankind, is a watery world and the only planet on which life is known
to exist! (1.6.x)(1.4.1) Earth is the third planet from the Sun, and the one against which all other planets are measured! (1.6.x)(1.4.1)
Right Drag with your mouse after you run the links above that display the planetary orbits to get a good sense of their 3-dimensional aspects.

Are you unfamiliar with our 1.6.x and 1.4.1 links? For an explanation click here.

Why Earth Has Seasons:
NASA graphic
NASA animation (req. Flash)

The Reasons for Seasons is a terrific interactive showing how Earth's tilt and motions create our seasons.

Earth's Seasons great tool from UNL (requires Flash)
How Earth's Snow & Ice Cover Vary with the Seasons CLIMATIC VS. ASTRONOMICAL SEASONS
Most school children know that the climatic seasons of the Northern and Southern Hemispheres are the reverse of each other's. For example, climatically-speaking, when it is Summer in the Northern Hemisphere, it is Winter in the Southern Hemisphere.

However, the "astronomical" seasons, as well as their respective equinoxes and solstices, have traditionally always been named for the "climatic" seasons of the Northern Hemisphere, (no doubt because roughly 90% of Earth's population lives there.) Thus, the Summer Solstice, for instance, is the solstice in June that marks the start of the Northern Hemisphere's summer.

Unfortunately this traditional naming convention creates an ambiguity. It means that astronomers in the Southern Hemisphere experience the traditional Summer Solstice at the start of their "climatic" Winter!

This is why we increasingly see the less traditional (and slightly less recognizable) terms: March Equinox, June Solstice, September Equinox and December Solstice. As these terms eliminate the traditional ambiguity, they are becoming accepted as the best ways to refer to the equinoxes and solstices.

WHY THE LENGTHS
OF THE SEASONS
ARE NOT EQUAL
Since their beginnings and ends are strictly defined by the arrival of the Sun at the equinoxes and the solstices in our sky, our astronomical seasons have durations of specific lengths. Although many people believe that the lengths of the astronomical seasons are the same, this proves not to be the case. This is because, while the equinoxes and solstices are spaced at equal intervals of 90° around the Celestial Sphere, Earth's changing velocity in its elliptical orbit causes the Sun to appear to arrive a little early at parts of the sky, and a little late at others. For the Northern Hemisphere, Summer thus becomes the longest of the "astronomical" seasons and Winter the shortest.

Lengths of the
Northern Hemisphere's "Astronomical" Seasons

Spring: 92 3/4 days
Summer: 93 2/3 days
Autumn: 89 5/6 days
Winter: 89 days.

Of course, in the Southern Hemisphere, for the lengths listed, the "Astronomical" Seasons are the reverse of those above.

When is Earth at perihelion and aphelion, respectively the points in its orbit closest to and furthest from the Sun?

Contrary to popular belief, Earth is closest to the Sun during the Northern Hemi- sphere's winter, NOT sum- mer! Conversely, Earth is farthest from the Sun during the Northern Hemisphere's summer, NOT winter! This indicates that our seasons are not caused primarily by Earth's varying distance from the Sun. No, our seasons are actually caused primarily by Earth's changing tilt in its orbit relative to the Sun!

In contemporary times Earth is generally closest to the Sun between January 2 and January 6, and farthest from the Sun between July 3 and July 7. NOAA Graphic

The excellent AstroPixels site provides a very good chart of Earth at Perihelion and Aphelion: 2001 to 2100.
MAKE COOL PAPER MODELS OF EARTH
CANON has a cool website that offers free downloads, including one that lets you make a cool 3-D paper model of Earth For an even greater challenge, make a 3-D paper puzzle of Earth!
MAKE PAPER MODEL OF ORION SPACECRAFT
NASA's new spacecraft will take us back to the Moon and beyond: 3-D paper model of Orion.
MAKE YOUR OWN COMPASS
From the National Oceanic & Atmospheric Admin. (NOAA), here's an activity that's fun! And potentially useful too! Make Your own Compass. Moreover, when you use the compass you make, you'll be confirming that Earth has a magnetic field!
VERIFY HOW GRAVITY WORKS
For thousands of years even the smartest people in the world accepted that heavier objects always fell to Earth faster than lighter objects. After you do the following simple little experiment, you will surely wonder why they never did something similar themselves! And you'll be smarter than them (well- about gravity anyway.)

Drop a quarter and a dime at the same time. Does one fall faster than the other? Does it make any difference if you drop them at the same time from a different height? To be sure of your answer, go ahead and repeat this quick experiment several times. It won't take you long to know more about gravity than the ancient "experts" did!

The following will help you enjoy this page's 1.6.x and 1.4.1 links that run events directly in CELESTIA. If you're new to the program, these tips will also help you learn to use it.

If CELESTIA's clock (i.e. the program's date and time) is not visible at the top-right of its window, press the V key until you see it. This will also turn on information text in other corners to help you keep track of several aspects of the event you're viewing. Keeping an eye on CELESTIA's clock at the top-right will help you appreciate how much time is passing in each view.

Pressing the "un-shifted" L key and K key respectively will speed up and slow down CELESTIA's flow of time by a factor of 10 in version 1.6.x and 1.4.1.

Pressing Shift+L and Shift+K respectively will speed up and slow down CELESTIA's flow of time by a factor of 2 in version 1.6.x only.

Pressing the J key (either shifted or "un-shifted") will reverse CELESTIA's flow of time in version 1.6.x and 1.4.1.

You'll find more information about many of CELESTIA's controls on our Learning Center page.

EARTH

(to update, reload page)
Courtesy: Fourmilab Switzerland

View Earth in 3-D NASA's WorldWind Explorer: go to
destinations, show day & night, time zones, more!
Current Distances and Views from the Sun and Moon
Current Location in Orbit

Physical Properties:
Diameter: Equa: 12,756.2 km Polar: 12,713.6 km
Rotational Flattening: 0.00335
Mass: 5.9736 trillion trillion tons
Volume: 1.08321 trillion cubic kilometers
Mean Density (Water = 1): 5.52
Surface Gravity (standard): 9.81 m/s2
Surface Temperatures: average 14°C (57°F)

Inclination of Axis to Orbit: 23.44° (1.6.x)
Compared to Other Planets
Cycle Period: 41,040 yr
Rotation:
Period:

Synodic ("Day" in Earth hrs): 24.00
Sidereal (in Earth hrs): 23.9345
Direction: West-to-East
Albedo (geometric): 0.37
Magnetic Field
Van Allen Radiation Belts
Plasmasphere
Magnetopause
Solar Interaction
Comparison

More Earths in 3-D:
NASA's Overview of Earth
WebGL Earth Point & Opposite Point
Web GL Hello World Globe zoom way in!
Great SketchFab 3-D Alt+Drag moves shadows
Another Another Another

Earth Surface:
Land Area: 29.2%
Area Covered by Water: 70.8%
The World's Water
NASA / JPL's Photojournal pages for Earth
Maps:
USGS: The National Map (great mapping tool)
NatGeo "MapMaker" awesome
Earth Climate Zones (req. Flash)
Standard Time Zones of the World
Another Good Time Zones Map
World Population Map fascinating
interactive 3-D!
DSN Current Day & Night Map
USGS "This Dynamic Planet" Front Back Site
U.S. Volcanoes & Current Activity Alerts
USGS "This Dynamic Earth" online edition
Plate Tectonics: Plate Borders & Motions
NASA GSFC Plate Boundaries: Oceans Drained
USGS How Plate Tectonics Works
Univ. of Kentucky's: Plate Tectonics (req. Flash)
NOAA's Natural Hazards Viewer
Maps & Vids of Earth's Paleo-History:
What Did Earth Look Like Years Ago? Use arrow
keys to change time periods.
EarthGuide's Global Plate Reconstr. (req. Flash)
From USGS, the Breakup of Pangaea
3-D Earth in the Times of the Dinosaurs

ROTATING EARTH FROM ABOVE NORTH POLE
(at the Equinoxes)

Earth Atmosphere:
Structure:
NASA Graphic 1
NASA Graphic 2
NASA Video ascending through Atmosphere
Composition

Earth Structure:
3D Earth Exploded View Another
Compared to Other Inner Planets
Earth Structure Video
Previously Unknown Radiation Belt

Spacecraft in 3-D:
Boeing CST-100 Starliner
SpaceX Crew Dragon
Hubble:#1 #2 #3
International Space Station:
#1 #2 #3 #4
Mir Space Station Sputnik
Explorer 1: #1 #2

Comparison of Earth-Satellite Orbital Geometries

Ring System: No

Planet Classifications:
Inner Planet (along with Mercury, Venus & Mars)
Terrestrial Planet (defines term)
Reference Planet:
Planets with smaller orbits are "Inferior" Planets
Planets with larger orbits are "Superior" Planets

Earth Orbit:(1.6.x)(1.4.1)
Period (sidereal) : 365.2564 solar days
Period (tropical) : 365.2422 solar days
Distance from Sun:
Mean: 1 AU (essentially defines measurement)
Mean: 149,597,870.7 km ( defined in 2012)
Perihelion: 147,098,000 km (0.983 AU)
Date of: betw. Jan 2 and Jan 6 (current era)
Aphelion: 152,096,400 km (1.017 AU)
Date of: betw. Jul 3 and Jul 7 (current era)

Velocity:
Mean: 107,200 km/hr
Min: 105,444 km/hr
Date of: betw. Jul 3 and Jul 7 (current era)
Max: 109,444 km/hr
Date of: betw. Jan 2 and Jan 6 (current era)
Eccentricity: 0.0167
Compared to Perfect Circle
Inclination to Ecliptic: 0° (Earth's orbit IS Ecliptic)

Milankovitch Cycles
Orbital Cycles:
Orbital Eccentricity:
Period: approx. 100,000 yr
Min. Eccentricity: 0.000055
Max. Eccentricity: 0.0679
Apsidal (Perihelion) Precession:
Period: approx. 112,000 yr
Axial Cycles:
Obliquity (Axial Tilt):
Period: approx. 41,000 yr
Min. Tilt: 22.1°
Max. Tilt: 24.5°
Axial Precession: (Precession of Equinoxes)
Period: 25,800 years
North Axis Direction: (J2000)
Right Ascension: 18h 0m 0s (270.00°)
Declination: 66° 33' 38.55" (66.56°)
In Constellation Draco
North Axis Map
South Axis Map

View of Earth in CELESTIA:
With Location Labels ON:(1.6.x)(1.4.1)
With Location Labels OFF:(1.6.x)(1.4.1)

Number of Moons: 1(Luna, aka "The" Moon)
NASA's Overview of the Moon (in 3-D!)
Compare to Other Moons
Spin-Orbit Resonance with Earth: Yes, 1 to 1
(so the same side of Moon always faces Earth)
View Earth-Moon Barycenter video

Partial Information Source: NASA Fact Sheets
ADJECTIVES MEANING
"pertaining to Earth"

earthly, earthy
terran (often capitalized), terrestrial, terrene (all from Latin: Terra)
telluric, tellurian

Equinoxes, Solstices & the
Sun's Apparent Motion

Though its 2 primary views display Earth's rotation at different speeds, here's a great Flash tool (in Dutch) showing the geometry of Earth in its orbit. Moreover, it lets you Easily Find Earth's Current Tilt Relative to the Sun. In addition you can change a few Settings to view how Earth's varying tilt throughout the year produces the seasons and affects the lengths of our days and nights. Changing the month is most instructive. Note: in this animation the Vernal Equinox ( ) is essentially toward the bottom of your screen in its Northern Hemisphere view and outward toward you in its Oblique view.

Showing the relationship between where Earth is in its orbit, its tilt, and the length of its days, here's a nice Flash animation from the Santa Barbara Physics Dept. Note that the animation's shadow does not account for twilight and, where it shows Earth's orbit, the direction of the Vernal Equinox ( ) is out from the screen, i.e. toward the viewer. Length of Earth's Days at Various Times of Year.
THE SUN'S LOCATION IN EARTH'S SKY
Here's a nice interactive Flash demo that shows where the Sunn appears in the sky throughout the year. The Sun's Location Along the Zodiac at Various Times of Year. Drag its red pointer right and left over the names of the months. You can also drag the Zodiac itself.

Here's a nice interactive Flash demo that lets you relate where the Sun rises and sets on your horizon to the season. How Far North and South the Sun Rises and Sets at Various Times of Year.
EARTH'S PRECESSION

Earth's precession is its gradual "wobble" that causes each of our home planet's poles to trace a circle against the background stars every 25,800 years. The result of gravitational forces primarily of the Sun and the Moon on our planet's equatorial bulge, this fundamental motion of Earth is not unlike that of a precessing gyroscope. This motion causes our planet to have different North Stars during its 25,800-year cycle! Our current North Star is Polaris (alpha Ursae Minoris.)

Unlike Earth's rotational axis, its "precessional axis" is essentially fixed. While its north end points toward the constellation Draco, its other end points toward the southern constellations of Dorado and Pictor. Around this axis, the direction of Earth's wobble is clockwise when we look down on Earth's Northern Hemisphere.

You can find an explanation of how you may view Earth's precession in CELESTIA 1.6.x on our Tips page.

Also check out the videos on our Earth Weather page.
LINKS TO MORE NASA VIDEOS & INFO
You must have the noted player installed to view these. Note: you might have to click on these more than once, as some NASA servers (like http://svs.gsfc.nasa.gov in particular) can be temperamental and slow to connect. If a video does not load, try again at another time.

Draining the Oceans. Intriguing View of Earth without its Oceans! (QuickTime) Video Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio. U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Geophysical Data Center, 2006, 2-minute Gridded Global Relief Data (ETOPO2v2). The Blue Marble Next Generation data is courtesy of Reto Stockli (NASA/GSFC) and NASA's Earth Observatory.

Ocean Current Flows Around the Mediterranean Sea. (Windows Media Player or QuickTime) Video Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio.

Earth's Water Cycle: Video Tour from NASA/Goddard Space Flight Center.

Hourly Evaporation from the GEOS-5 Model. Note how evaporation, fueled mainly by the Sun, varies with day and night much more greatly over land than over the oceans. (QuickTime) Video Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio The Blue Marble data is courtesy of Reto Stockli (NASA/GSFC).

1997 Auroral Substorm from POLAR Spacecraft. (QuickTime) Video Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio.

© 2007- by Gary M. Winter. All rights reserved.

Interested in political cartoons and humor?
Check out The HIPPLOMATS™.

SkyMarvels, Sky Marvels, SkyMarvels.com, All about Earth! Earth's 12-Month Heartbeat! Earth Day-Night Map, Daylight Map, Daylight World Map, sunlight world map. Earth's Position in its orbit! Earth Interactives. Earth Animations. Earth Maps! Earth Activities! Earth Seasons! Earth Satellite Info! celestia4all, celestiaforall, CELESTIA, astronomy, space, simulations, animations, downloadable astronomy posters, stars, planets, Inner Planets, Outer Planets, Inferior Planets, Superior Planets, moons, asteroids, comets, Oort Cloud, galaxy, galaxies, Milky Way, Andromeda, globular clusters, binaries, quasars, black holes, supermassive black holes, telescope, telescopes, planetarium, software, freestuff, satellites, add-ons, addons, scripts, eclipses, Solar Eclipses, Lunar Eclipses, Solar Eclipse Finder, Lunar Eclipse Finder, mutual eclipses, transits, occultations, Solar System, CELES-TOOLS, celeSTARrium, CELX, CELX programming, Freebies, Bonuses, multiple views, atronomical unit, light year, parsec, meteors, meteor showers, Perseids, Geminids, Leonids, barycenter, time, Time Zones, tides, alignments, conjunctions, oppositions, seasons, apogees, perigees, aphelion, perihelion, Earth, Luna, Mercury, Venus, Mars, Jupiter, Galilean Moons, Io, Europa, Ganymede, Callisto, Saturn, Titan, rings, Uranus, Neptune, Triton, E-MSpectrum, electromagnetic spectrum, astronaut, equinoxes, solstices, precession, rotation, spin, inclination, tilt, Ecliptic, orbits, ellipse, parabola, hyperbola, USGS Daily Earthquake Map

Planet Comparison HD vid.

Earth's Tilt Today
relative to the Sun

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Sky-Gifts. Your support is greatly appreciated!

ISS (Int'l Space Station): Current Location
USGS's LATEST

Daily Earthquake Map
Wildfire Map

NOAA's LATEST

Aurora Forecast:

Tides and Currents Map
NASA's LATEST Earth from Space Today
ISS (Int'l Space Station) Info:

Live ISS Stream Spot the Station
ESA's LATEST ISS Location Follow ESA Missions EARTH FUN FACTS
Roughly 90% of Earth's pop- ulation lives in the Northern Hemisphere! World Popula- tion is a very cool Chrome Experiment that shows this as a global 3-D graph!

All of Earth's water would fit into a sphere about 1,380 km (860 miles) in diameter!

3% of Earth's water is fresh water; 97% is salt water!

Glaciers contain roughly 2/3 of Earth's fresh water!

At present, glaciers blanket roughly 1/10 of Earth's land area. During the last major Ice Age about 10,000 years ago, they blanketed almost 1/3 of Earth's land area!

You weigh more at the poles than at the Equator! About
a half of one percent more! This is because Earth rotates on its axis.

For the same reason, Earth bulges at the equator. The result is that sea level at the equator is about about 21 kilometers (about 13 miles) further from Earth's center than sea level at the poles!

The umbra, the dark portion of Earth's shadow, has an average length nearly equal to the diameter of the Sun!

QUICK ACCESS LIST

Note: some links are echoed elsewhere on this page and may include descriptive text.
NASA's Overview Earth (in 3-D!)
NASA's WorldWind Explorer Earth (in 3-D!) Takes you to destinations, lets you show day and night, time zones and more!

The Reasons for Seasons Comparison of Satellite Orbital Geometries
Stuff in Space may startle you with a live 3D view of everything orbiting Earth! Satellite Map is similar.

Links to interactive features that show Earth's orbit in 3-D can be found on our Solar System page
NASA's Eyes on the Earth
Here's a NASA "Special": Ocean Worlds

From UNL here's a very nice Flash interactive illustrating Latitude and Longitude

Length of Earth's Days at Various Times of Year from the Santa Barbara Physics Dept site (requires Flash).

Similar to the interactive above, this one lets you Easily Find Earth's Current Tilt Relative to the Sun

From UNL here's a fantastic Flash interactive that lets you study what produces Earth's Seasons during our yearly journey around the Sun!

From U. of Colorado's LASP site, a Flash exploration of the greenhouse effect and planetary atmospheres in: Goldilocks and the Three Planets! You'll even see a "dust devil" on Mars!

Is our climate changing? Find out here with NASA's Climate Time-Machine

Discover the application of space-related discoveries and improvements in everyday things all around you in this very cool 3-D feature: NASA Home and City. Takes a moment to load. Home City

From the ESO, here's a very nice 3-D interactive of the Hubble Space Telescope

Roughly 90% of our planet's human population resides in the Northern Hemisphere! Here's a very cool Chrome Experiment that shows this with Earth as a 3-D graph: World Population

This nice map, created by André Christoffer Andersen, estimates World Population by Latitude & Longitude.

Planet Size Comparison

Planet Mass Comparison Add more instances of less massive planet to balance the scale. Requires Flash.
SKYMARVELS™
CELESTIA ADD-ONS FEATURING EARTH
Solar
Eclipse Finder

Lunar
Eclipse Finder
SKYMARVELS™
POSTERS FEATURING EARTH
Earth's Tides

Our Corner of the Cosmos

Anatomy of the Milky Way
SKYMARVELS™
VIDEOS FEATURING EARTH The Sun's Signature
Earth's Structure (short)

Earth's Structure (longer)
Perseid Meteor Shower 2010 Geminid Meteor Shower 2010 Geminid Meteor Shower 2012 Perseid Meteor Shower 2013 The Speed of Light Stunning Fields of View 001
Stunning Fields of View 002

Have You Ever . . . ?
"celestia4all" Site Preview

Solar Eclipses:

Solar Eclipses thru 2012

Solar Eclipse 2010 Jul 11

Solar Eclipse 2012 Nov 13

Solar Eclipse 2013 Nov 3

Lunar Eclipses:

Lunar Eclipses thru 2012

Lunar Eclipse 2010 Jun 26

Lunar Eclipse 2010 Dec 21

Lunar Eclipse 2011 Jun 15
Moon's Occultation of Venus 2010 May 16 Moon's Occultation of Venus 2010 Sep 11
How Big Is Our Moon?
The Same Side of the Moon Always Faces Earth
The Earth-Moon Barycenter

The Solar System Barycenter
Phases of the Moon

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earth info.  earth!  all about earth!  earth's 12-month heartbeat!  earth day-night map

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sunlight world map.  earth's position in its orbit!  earth interactives.  earth animations.  earth maps!  earth activities!  earth seasons!  earth satellite info!  celestia4all

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SkyMarvels.com EARTH Info. EARTH! All about EARTH! Earth's 12-Month Heartbeat! Earth Day-Night Map, Daylight Map, Daylight World Map, sunlight world map. Earth's Position in its orbit! Earth Interactives. Earth Animations. Earth Maps! Earth Activities! Earth Seasons! Earth Satellite Info! Streak through the universe in stunning 3-D! Trek to planets, moons, stars, galaxies!

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Forests are one of the world's most significant sources of food, new medicines and oxygen. Scientist and author Diana Beresford-Kroeger explores our profound biological and spiritual connection with trees, and meets people who are taking the lead to replant, restore and protect the last of the planet's great ancient forests.

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Call of the Forest: The Forgotten Wisdom of Trees

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Forests are one of the world's most significant sources of food, new medicines and oxygen. Scientist and author Diana Beresford-Kroeger explores our profound biological and spiritual connection with trees, and meets people who are taking the lead to replant, restore and protect the last of the planet's great ancient forests.

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Hi there. We're ExploreLearning!

We're an education technology company creating seriously fun solutions for the most critical challenges in K-12 STEM learning.

What's this serious fun business all about? Tell me more...

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We're an education technology company creating seriously fun solutions for the most critical challenges in K-12 STEM learning.

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Math explained in easy language, plus puzzles, games, quizzes, videos and worksheets. For K-12 kids, teachers and parents.

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Our 3D-models are linked to other BioInteractive educational media, such as short films, lectures, and classroom activities, to further support learning key concepts in biology and earth science. All our models are based on current research data.

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Doodle God Blitz features over 100 new elements and missions, a colorful planet full of elements, and new modes with artifacts, quests, and puzzles. It also has new episodes such as the modern age, technology, and the Wold of Magic.

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CodeCombat: Learn to Code by Playing a Game

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Learn typed code through a programming game. Learn Python, JavaScript, and HTML as you solve puzzles and learn to make your own coding games and websites.

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Demos - Demonstration ideas for teaching physics and physical science.

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Comprehensive Physics and Physical Science Demonstration reference and resource.

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Dig into Mining is an interactive program for grades 6-8 that spotlights the value and uses of transition metals including copper, gold and molybdenum and fosters a deeper understanding of the mining industry by equipping educators, students and families with dynamic resources including a virtual field trip, interactive digital learning tools and career exploration activities.

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Learn how to make a 360 video camera! https://www.youtube.com/watch?v=KSRaU9MHVVg -~-~~-~~~-~~-~- Anyone that wants to be serious about learning electronics first has to tackle Ohm's law. As confusing as it may appear, Ohm's law actually a very simple concept. So let's take a step back and see what the concept really means before we get all mathy.

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By converting our sims to HTML5, we make them seamlessly available across platforms and devices. Whether you have laptops, iPads, chromebooks, or BYOD, your favorite PhET sims are always right at your fingertips.Become part of our mission today, and transform the learning experiences of students everywhere!

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Kids learn core programming concepts through engaging games developed with real teachers and kids.

Foster creativity and critical thinking.

A whole world of coding is available at your fingertips. With interactive lessons, creative activities and more, your child will be prepared for the digital future they'll be a part of.

Screentime that will leave you feeling all warm and fuzzy

Meet the FuzzFamily - your coding companions in the world of Kodable

The steady-haired blueFuzz, inquisitive shaggyFuzz, and the fan-favorite prismFuzz are just a few of the helpful companions that kids will have on their coding journey.

Kids love Kodable! So do teachers and parents!

Kodable is used by millions of kids all around the world. Check out some of the fun ways people are using Kodable today!

Trusted by Experts and Educators

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We're thankful for you! ❤️🧡🤎 Savor $50 off a lifetime membership Kodable has been used in over 50% of US Elementary Schools - engaging millions of kids with a fun, no-nonsense set of games that teach the basics of coding, logical thinking, and more.

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TED-Ed celebrates the ideas of teachers and students around the world. Discover hundreds of animated lessons, create customized lessons, and share your big ideas.

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There are a number of collections that are like this - collections that aim to demonstrate science concepts in a way that is easily digestible. Each is unique in its own way, and I really encourage you to spend some time Google-ing about and finding all the various lists, as many of them are terribly informative.

Here, full disclosure, we tried to trace down the original source. This means that, if we found something on Reddit, we did a reverse image search to trace down the original creator and original appearance (and listed the credits as such).

Anyways, we hope you enjoy the show.

1) This is a Reuleaux Triangle

There are curves of constant width besides circles and spheres. It's a convex planar shape whose width is the same regardless of the orientation of the curve.

2) These Curves of Constant Width Can Drill Square Holes (Yes, Square Holes)

3) This Is Why Pi Is Significant

This animation shows the act of unrolling a circle's circumference (or trying to), illustrating the ratio π.

4) This Is How to Make Pascal's Triangle

These are used in algebra and probability, where it can be used to find Combinations.

5) This Is a Miura Fold

It's a method of folding a flat surface into a smaller size. It consists of tessellated parallelograms and is used in the solar panels of satellites.

6) This Is a Parabola

If you kick a soccer ball (or shoot an arrow, fire a missile, or throw a stone), it will arc up into the air and come down again...following the path of a parabola!

7) This Is a Radian

The radian is the standard unit of angular measure, used in many areas of mathematics.

8) This Is a Matrix Transposition

A matrix is formed by turning all the rows of a given matrix into columns and vice-versa. The T. transpose of matrix A is written A

9) This Is a Sierpinski Triangle

It's a kind of fractal, a mathematically generated pattern that can be reproducible at any magnification or reduction.

10) Here's How You Convert Cartesian (Rectangular) to Polar Coordinates

11) This Is How Exterior Angles of Polygons Work

They add up to 360 degrees.

12) This Is a Hyperboloid Made up of Straight Lines

13) This Is Also a Hyperboloid of Straight Lines

14) This Is How White Blood Cells Keep You Safe

In the video, a white blood cell chases and engulfs this bacteria - watch until the end!

15) This Is Earth's Ice and Vegetation Cycle over a Year

16) There Is Flammable Matter in Smoke

Smoke is not just nothingness, obviously, so it can burn.

17) This Is What It Looks Like When You Set a Flammable Gas on Fire in a Contained Environment

18) This Is Quantum Levitation Due to Vortex Pinning

A superconductor levitates over a magnetic track.

19) This Is How Tension Works in Relation to Falling Objects

Watch a slinky fall to the Earth; this is how slinkies always fall.

20) Not All Gasses Have the Same Density

Sulphur hexafluoride is much denser than air.

21) BONUS! And Remember, All Those Amazing Astronomy Images Are Much More Than 2D Images...

The Elephant's Trunk nebula in 3D.

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20 Gifs That Teach You Science Concepts In Seconds

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There are a number of collections that are like this - collections that aim to demonstrate science concepts in a way that is easily digestible. Each is unique in its own way, and I really encourage you to spend some time Google-ing about and finding all the various lists, as many of them are terribly informative.

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Science Game for Kids

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A simple but addictive game. Start with four basic items and use them to find dinosaurs, unicorns and spaceships!

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Birth of the Solar System

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Stephen Hawking - Formation of the Solar System