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DNA recombination can be a confusing concept, especially in how it can influence consumer genetic test results. Let us explain with Lego blocks.

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big bang video universe creation - Bing video

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Before the Big Bang Hawking The Next Big Bang Scientist Against Big Bang Theory Big Bang Made CD What Created the Big Bang Big Bang Before Matter The Problems Big Bang Theory The Big Bang History Channel Flat Universe Big Bang Theory Big Bang and Creation Who Created the Big Bang Genesis Big Bang Theory Big Bang Theory Universe Creation

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Post by ACSReactions.

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CDS Videos

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CDS Videos is the CERN official repository to archive and disseminate videos.

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We're not going to fly through a nebula, not in the lifetimes of anyone alive today. Possibly not ever in anyone's lifetime.

But based on data from the Hubble and Spitzer telescopes, we now have a feel for what it may be like to fly through one of the most famous ones - the Orion nebula.

The nearest bright nebula to us is around 695 light-years away, and the Orion nebula is much farther, around 1,344 light-years away. So even if we had light-speed travel, it would take many generations aboard a generation ship to get there.

But by combining visible and infrared images of the giant nebula's star-forming heart, astronomers and visualisation specialists have created a 3D flythrough so that you can get a taste for what it might feel like to be a space explorer.

The newly released video is an update and expansion of previous iterations of Orion nebula flythroughs based on Hubble data in 2014, and a 2010 snippet of an IMAX film about the Hubble Space Telescope narrated by Leonardo DiCaprio.

The three-minute movie is intended to convey what space is really like - not the static 2D images we usually see, but huge, three-dimensional, dynamic and evolving.

"By adding depth and structure to the amazing images, this flythrough helps elucidate the universe for the public, both educating and inspiring," said Space Telescope Science Institute visualisation scientist Frank Summers.

To us on Earth, looking up at the night sky with naked eyes, the Orion nebula is just a pinprick that appears as a star. In reality it's huge, around 24 light-years across, and contains an intense stellar nursery - a region wherein the nebula's dust is furiously coalescing into young stars.

It's a young nebula, only about two million years old, so it has provided a lot of information about how stars and planets are formed.

By combining Hubble data with Spitzer data, the team has been able to provide a much more detailed flythrough. Hubble's visible data shows very hot regions and objects, since they are more likely to glow in the visible spectrum, while Spitzer's infrared data shows cooler objects and regions.

The team modelled the nebula like a topography, adding in wispy gas, bow shocks, stars and protoplanetary discs, switching the view between Hubble and Spitzer data to both help viewers understand the nebula, and to understand how this sort of science works.

"The main thing is to give the viewer an experiential understanding, so that they have a way to interpret the images from telescopes," Summers said.

"It's a really wonderful thing when they can build a mental model in their head to transform the two-dimensional image into a three-dimensional scene."

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This Spectacular Video Shows What It Would Be Like to Fly Through The Orion Nebula

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We're not going to fly through a nebula, not in the lifetimes of anyone alive today. Possibly not ever in anyone's lifetime. But based on data from the Hubble and Spitzer telescopes, we now have a feel for what it may be like to fly through one of the most famous ones - the Orion nebula.

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The Beginning of Everything -- The Big Bang

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A clip from a BBC documentary explaining Hawking radiation around black holes.

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Neil Degrasse Tyson Evidence for the Big Bang Theory -https://www.youtube.com/watch?v=hcds5Ob59Dg

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In the second stop in his exploration of the wonders of the universe, Professor Brian Cox goes in search of humanity's very essence to answer the biggest questions of all: what are we? And where do we come from? This film is the story of matter - the stuff of which we are all made.

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The Science of Nuclear Power - Is Nuclear Power Safe? - Horizon - BBC

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Professor Jim Al-Khalili explains the science behind nuclear power, showing how it is used to generate electricity. Informative clip from acclaimed BBC 2 science series, Horizon. Subscribe to the BBC Worldwide channel: http://bit.ly/yqBWhy BBC Worldwide Channel: http://www.youtube.com/BBCWorldwide

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NASA Science is Delivering

NASA Science is delivering: every second of every day, of every week, of every year. 2024 is proving to be yet another year of exceptional scientific discovery and achievement. From soft landing back on the Moon a few months ago, to celebrating the Heliophysics Big Year and a Total Solar Eclipse in the contiguous United States, to receiving stunning imagery from James Webb, NASA Science is as busy as ever. Recently launched earth science missions are also providing us unprecedented views of our planet and incredible insight into the health of our oceans and atmosphere, and helping decision-makers improve lives on Earth and safeguard our future. And we are charting a new, sustainable path for Mars Sample Return.

Looking ahead, we have many exciting launches on the horizon. At NASA, we are fortunate that our science and exploration endeavors are inextricably linked and help us discover and innovate for the benefit of humanity. Together, we explore to advance scientific understanding. Ultimately, exploration enables science, and science enables exploration.

The NASA Science team is continuing to deliver for the benefit of all.
Read Nicky Notes

GOES-U

Launch is targeted for June 25, 2024. GOES-U will provide advanced detection and monitoring of environmental phenomena that directly affect public safety, protection of property, and the nation's economic health.

Europa Clipper

Launching in October 2024, Europa Clipper's main science goal is to determine whether there are places below the surface of Jupiter's icy moon, Europa, that could support life.

VIPER

VIPER launches late 2024 and will be NASA's first robotic Moon rover to measure the location and concentration of water ice and other resources. These resources could eventually be harvested to sustain human exploration on the Moon, Mars - and beyond!

May 2024 has already proven to be a particularly stormy month for our Sun. During the first full week of...

Why Does NASA Want to Explore Jupiter's Ocean Moon?

Everywhere there's water on Earth, there's life. Does that hold true elsewhere in our solar system? NASA's Europa Clipper mission will investigate Jupiter's icy moon Europa, which - with its subsurface ocean - is one of the most promising places in our solar system to find environments capable of supporting life.
Learn More about Europa Clipper

The Sun and Heliophysics

NASA studies the star at the center of our solar system and its influence on space, Earth, and our solar system. This research helps us to not only understand how the universe works, but also protect our technology and astronauts in space.
Learn More

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NASA Science is Delivering NASA Science is delivering: every second of every day, of every week, of every year. 2024 is proving to be yet another year of exceptional scientific discovery and achievement.

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Earth Compared to the Rest of the Universe

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Earth Compared to the Rest of the Universe

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The most Radioactive places on Earth: ASwesome!

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The most Radioactive places on Earth: ASwesome!

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Who on Earth is exposed to the most ionizing radiation? Check out Audible: http://bit.ly/AudibleVe I'm filming a documentary for TV about how Uranium and radioactivity have shaped the modern world. It will be broadcast in mid-2015, details to come. The filming took me to the most radioactive places on Earth (and some places, which surprisingly aren't as radioactive as you'd think).

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The Radium Girls were the first people who worked, for years, with one of the world's most radioactive substances -- and suffered the consequences. Hosted by: Hank Green ------------- Today's President of Space: http://goo.gl/kLT65q ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them!

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Neil Degrasse Tyson Evidence for the Big Bang Theory

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The Big Bang theory states that approximately 14 billion years ago the universe burst into being from an unknown cosmic trigger. The early universe, contained within just a few millimeters, was very hot and densely packed with matter. Ever since that initial explosion, the universe has continued to expand and cool.

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Radiation: HOw do we know the Big Bang Happened?

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Radiation: HOw do we know the Big Bang Happened?

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How We Know The Big Bang Actually Happened

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Click here to download the TestTube app: http://dne.ws/1lMxL1j Earlier this week, astronomers announced that they directly observed gravitational waves. These waves are evidence for quantum gravity. How does this prove the Big Bang actually happened? Trace is joined by Ian O'Neill to explain this new, groundbreaking finding.

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NASA | Radiation Shielding Materials Containing Hydrogen, Boron, and Nitrogen

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Space radiation can cause serious damage to human DNA. It can also cause a variety of long term ailments including cataracts, cancer, and sterility. With current technology, humans cannot travel beyond low Earth orbit (LEO) for more than 100 days and still stay below permissible radiation exposure limits.

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NASA | Space Radiation Shielding for Long Duration Human Space Missions

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NASA researchers are investigating the engineering aspects of using magnetic fields to deflect space radiation so astronauts will be protected when traveling on long duration missions.

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Radiation WHat Happened before the Big Bang?

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Radiation WHat Happened before the Big Bang?

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What Happened Before The Big Bang? - Earth Unplugged

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What actually happened before the big bang, can we find out? Maddie Moate explains what we know. Subscribe to Earth Unplugged - http://www.youtube.com/subscription_center?add_user=earthunpluggedtv Check out the BBC Earth website http://www.bbc.com/earth Join the Earth Unplugged community: Facebook: http://www.facebook.com/EarthUnplugged Twitter: http://www.twitter.com/earthunplugged Google+: http://goo.gl/RKq6q http://www.youtube.com/user/EarthUnpluggedTV http://www.youtube.com/subscription_center?add_user=earthunpluggedtv This is a channel from BBC Worldwide who help fund new BBC programmes.

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Let's see if we can learn a thing or two about significant figures, sometimes called significant digits. And the idea behind significant figures is just to make sure that when you do a big computation and you have a bunch of digits there, that you're not over-representing the amount of precision that you had, that the result isn't more precise than the things that you actually measured, that you used to get that result. Before we go into the depths of it and how you use it with computation, let's just do a bunch of examples of identifying significant figures. Then we'll try to come up with some rules of thumb. But the general way to think about it is, which digits are really giving me information about how precise my measurement is? So on this first thing right over here, the significant figures are this 7, 0, 0. So over here, you have three significant figures. And it might make you a little uncomfortable that we're not including these 0's that are after the decimal point and before this 7, that we're not including those. Because you're just like, that does help define the number. And that is true, but it's not telling us how precise our measurement is. And to try to understand this a little bit better, imagine if this right over here was a measurement of kilometers, so if we measured 0.00700 kilometers. This would be the exact same thing as 7.00 meters. Maybe, in fact, we just used a meter stick. And we said it's exactly 7.00 meters. So we measured to the nearest centimeter. And we just felt like writing it in kilometers. These two numbers are the exact same thing. They're just different units. But I think when you look over here, it makes a lot more sense why you only have three significant figures. These 0's are just shifting it based on the units of measurement that you're using. But the numbers that are really giving you the precision are the 7, the 0, and the 0. And the reason why we're counting these trailing 0's is that whoever wrote this number didn't have to write them down. They wrote them down to explicitly say, look, I measured this far. If they didn't measure this far, they would have just left these 0's off. And they would have just told you 7 meters, not 7.00. Let's do the next one. So based on the same idea, we have the 5 and the 2. The non-zero digits are going to be significant figures. You don't include this leading 0, by the same logic that if this was 0.052 kilometers, this would be the same thing as 52 meters, which clearly only has two significant figures. So you don't want to count leading 0's before the first non-zero digit, I guess we could say. You don't want to include those. You just want to include all the non-zero digits and everything in between, and trailing 0's if a decimal point is involved. I'll make those ideas a little bit more formal. So over here, the person did 370. And then they wrote the decimal point. If they didn't write the decimal point, it would be a little unclear on how precise this was. But because they wrote the decimal point, it means that they measured it exactly to be 370. They didn't get 372 and then round down. Or they didn't have kind of a roughness only to the nearest tens place. This decimal tells you that all three of these are significant. So this is three significant figures over here. Then on this next one, once again, this decimal tells us that not only did we get to the nearest one, but then we put another trailing 0 here, which means we got to the nearest tenth. So in this situation, once again, we have three significant figures. Over here, the 7 is in the hundreds. But the measurement went all the way down to the thousandths place. And even though there are 0's in between, those 0's are part of our measurement, because they are in between non-zero digits. So in this situation, every digit here, the way it's written, is a significant digit. So you have six significant digits. Now, this last one is ambiguous. The 37,000-- it's not clear whether you measured exactly 37,000. Maybe you measured to the nearest one, and you got an exact number. You got exactly 37,000. Or maybe you only measured to the nearest thousand. So there's a little bit of ambiguity here. If you just see something written exactly like this, you would probably say, if you had to guess-- or not guess. If there wasn't any more information, you would say that there's just two significant figures or significant digits. For this person to be less ambiguous, they would want to put a decimal point right over there. And that lets you know that this is actually five digits of precision, that we actually go to five significant figures. So if you don't see that decimal point, I would go with two.

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Intro to significant figures (video) | Khan Academy

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Let's see if we can learn a thing or two about significant figures, sometimes called significant digits. And the idea behind significant figures is just to make sure that when you do a big computation and you have a bunch of digits there, that you're not over-representing the amount of precision that you had, that the result isn't more precise than the things that you actually measured, that you used to get that result.

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Practice Problem: Kinetic and Potential Energy of a Ball on a Ramp

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Work, Energy, and Power: Crash Course Physics #9

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Introduction to work and energy | Work and energy | Physics | Khan Academy

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Conservation of energy | Work and energy | Physics | Khan Academy

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Energy & Chemistry: Crash Course Chemistry #17

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Calorimetry

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Uploaded by Stephen Cooke on 2015-08-30.

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A strong fiber from Hagfish. excerpt from NOVA's Making Stuff Wilder http://www.pbs.org/wgbh/nova/tech/making-more-stuff.html#making-stuff-wilder Support NOVA by becoming a member of your local PBS TV station. pbs.org Copyrights belong to NOVA and PBS

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This is where poly(vinyl alcohol- co-vinyl acetate) comes to the rescue. You see, this copolymer has an identity crisis. The alcohol groups are hydrophilic. They love water, and want to dissolve in it. But the acetate groups are hydrophobic. They hate water and don't want to dissolve in it.

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3. Slowly pour all of the borax solution into the glue solution, and stir with a clean popsicle stick. You should notice a sudden change in the solutions.

Your slime is done when you can pick up your popsicle stick and most of the slime comes out on the stick.

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3. Slowly pour all of the borax solution into the glue solution, and stir with a clean popsicle stick. You should notice a sudden change in the solutions. Your slime is done when you can pick up your popsicle stick and most of the slime comes out on the stick.

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Putting the P in Pee - How One Man Playing with Human Urine Made a Historic Discovery

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→Subscribe for new videos every day! https://www.youtube.com/user/TodayIFoundOut?sub_confirmation=1 →How "Dick" came to be short for 'Richard': https://youtu.be/BH1NAwwKtcg?list=PLR0XuDegDqP2Acy6g9Ta7hzC0Rr3RDS6q Never run out of things to say at the water cooler with TodayIFoundOut! Brand new videos 7 days a week!

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Animal Pharm: From Mouse To Man - Real Stories

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Explore the spooky prospect of regeneration, with mice that show powers no mammal was previously thought to have; and witness how, with tissue engineering, scientists can now manipulate cartilage and skin cells so they can grow them into any shape. Want to watch more full-length Documentaries?

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Animal Pharm  Food For Thought Full Documentary   Real Stories

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Uploaded by People of Earth on 2017-06-27.

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Evolution Story in a Minute: Natural Selection and Adaptation | HHMI BioInteractive Video

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The rock pocket mouse is a spectacular example of natural selection over a very short time period. See how to tell an evolution story in less than 1 minute with this video. See the whole film at http://www.hhmi.org/biointeractive/making-fittest-natural-selection-and-adaptation -- or watch an interactive version with quiz at http://www.hhmi.org/biointeractive/pocket-mouse-film-quiz

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This collection of science videos and media-enhanced lesson plans draws upon the powerful documentaries of public television's award-winning natural history series, Nature. The video segments have been carefully selected to engage students with key curriculum concepts. The lesson plans incorporate hands-on activities, online resources, and video to interactively and creatively address topics and standards in Life Science/Living Environment and Earth Science.

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Meet the tardigrade, the toughest animal on Earth - Thomas Boothby

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Can wildlife adapt to climate change? - Erin Eastwood

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Why is biodiversity so important? - Kim Preshoff

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Part 1: How Does New Genetic Information Evolve? Point Mutations

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The sum rule and product rule. Applying these rules to solve genetics problems involving many genes.

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Incomplete Dominance, Codominance, Polygenic Traits, and Epistasis!

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Sex-linked traits | Biomolecules | MCAT | Khan Academy

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Chromosomal basis of sex. Sex-linked traits. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/test-prep/mcat/biomolecules/chromosomal-inheritance/v/punnett-square-fun?utm_source=YT&utm_medium=Desc&utm_campaign=mcat Missed the previous lesson? https://www.khanacademy.org/test-prep/mcat/biomolecules/chromosomal-inheritance/v/evidence-that-dna-is-genetic-material-2?utm_source=YT&utm_medium=Desc&utm_campaign=mcat MCAT on Khan Academy: Go ahead and practice some passage-based questions! About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom.

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If you follow the necessary steps in solving genetic problems with Punnett Squares, life will be a breeze for you. It is important that you follow the necessary steps!

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Dihybrid Cross

Definition: A dihybrid cross is a breeding experiment between P generation (parental generation) organisms that differ in two traits. The individuals in this type of cross are homozygous for a specific trait. Traits are characteristics that are determined by segments of DNA called genes. Diploid organisms inherit two alleles for each gene. An allele is an alternate version of a gene that is inherited (one from each parent) during sexual reproduction.

In a dihybrid cross, the parent organisms have different pairs of alleles for each trait being studied. One parent possesses homozygous dominant alleles and the other possesses homozygous recessive alleles. The offspring, or F1 generation, produced from the genetic cross of such individuals are all heterozygous for the specific traits. This means that all of the F1 individuals possess a hybrid genotype and express the dominant phenotypes for each trait.

Example: In the image above, the drawing on the left demonstrates a monohybrid cross and the drawing on the right demonstrates a dihybrid cross. The two different phenotypes in the dihybrid cross are seed color and seed shape. One plant is homozygous for the dominant traits of yellow seed color (YY) and round seed shape (RR). The genotype can be expressed as (YYRR). The other plant displays the homozygous recessive traits of green seed color and wrinkled seed shape (yyrr).

When a true-breeding plant with yellow seed color and round seed shape (YYRR) is cross-pollinated with a true-breeding plant with green seed color and wrinkled seed shape (yyrr), the resulting offspring ( F1 generation) are all heterozygous for yellow seed color and round seed shape (YyRr).

Self pollination in the F1 generation plants results in offspring ( F2 generation) that exhibit a 9:3:3:1 phenotypic ratio in variations of seed color and seed shape.

This ratio can be predicted by using a Punnett square to reveal the possible outcomes of a genetic cross based on probability. In the F2 generation, about 9/16 of the plants have yellow seeds with round shapes, 3/16 (green seed color and round shape), 3/16 (yellow seed color and wrinkled shape ) and 1/16 (green seed color and wrinkled shape). The F2 progeny exhibit four different phenotypes and nine different genotypes. It is the inherited genotype that determines the phenotype of the individual. For example, plants with genotypes (YYRR, YYRr, YyRR, or YyRr) have yellow seeds with round shapes. Plants with genotypes (YYrr or Yyrr) have yellow seeds and wrinkled shapes. Plants with genotypes (yyRR or yyRr) have green seeds and round shapes, while plants with the genotype (yyrr) have green seeds and wrinkled shapes.

Independent Assortment

Dihybrid cross pollination experiments led Gregor Mendel to develop his law of independent assortment. This law states that alleles are transmitted to offspring independently of one another. Alleles separate during meiosis, leaving each gamete with one allele for a single trait. These alleles are randomly united upon fertilization.

Dihybrid Cross vs Monohybrid Cross

As a dyhibrid cross deals with differences in two traits, a monohybrid cross is centered around a difference in one trait.

The parent organisms are both homozygous for the trait being studied, but have different alleles for those traits. One parent is homozygous dominant and the other is homozygous recessive. Like in the dyhbrid cross, the F1 generation produced in a monohybrid cross are all heterozygous and only the dominant phenotype is observed. However, the phenotypic ratio observed in the F2 generation is 3:1. About 3/4 exhibit the dominant phenotype and 1/4 exhibit the recessive phenotype.

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Definition: A dihybrid cross is a breeding experiment between P generation (parental generation) organisms that differ in two traits. The individuals in this type of cross are homozygous for a specific trait. Traits are characteristics that are determined by segments of DNA called genes. Diploid organisms inherit two alleles for each gene.

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Greatest Genetics Discoveries: Gregor Mendel.mp4

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How Mendel's pea plants helped us understand genetics - Hortensia Jiménez Díaz

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Support Stated Clearly on Patreon: https://www.patreon.com/statedclearly You've probably heard about GMOs or Genetically Modified Organisms but what exactly is a gene and what does it mean to modify the genes of a plant or animal? We hear about DNA and genes all the time in the news and in our biology classes but very few of us can actually explain what a gene is?

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Scientists at the Large Hadron Collider successfully turned it back on after two years of downtime. Proton beams will be accelerated, magnets will keep them on track, and the temperature will sink to almost-absolute zero. And then the fun will start. (Forbes) Use our resources to learn a little about the "biggest science experiment in the world." Teachers, scroll down for a quick list of key resources in our Teachers' Toolkit. Discussion Ideas

The Large Hadron Collider is a particle accelerator. What particles are being accelerated?
Protons, although CERN will remind you that they are not the only particles accelerated in the LHC. Lead ions are, too.

What are protons?

Protons are positively charged particles that can exist on their own (freely) or as part of the nucleus of an atom. Protons are a type of hadron, the particle that gives the LHC its name.

According to CERN, "The proton source is a simple bottle of hydrogen gas. An electric field is used to strip hydrogen atoms of their electrons to yield protons."

According to the Forbes article, the LHC will accelerate protons from 450 GeV to 13 TeV. What do these measurements mean?

eV stands for "electronvolt," a unit of energy or mass often used in particle physics. An electronvolt is the amount of energy an electron gains or loses after being accelerated by 1 volt of electricity.

G and T stand for the metric prefixes giga- (indicating a million) and tetra- (indicating a billion). So, over the course of the next six or so months, acceleration at the LHC will go from 450 million electronvolts (450 GeV) to a whopping 13 billion electronvolts (13 TeV).
To put this in perspective, according to CERN, 1 TeV is about the energy of motion of a flying mosquito . . . so the LHC will be powered by the energy of 13 billion flying mosquitoes?

According to Forbes, the LHC has had improvements to its cryogenic and vacuum systems. What is cryogenics? What is a vacuum?

How are protons accelerated in the LHC?

Accelerators speed them up: According to CERN, "The accelerator complex . . . is a succession of machines that accelerate particles to increasingly higher energies. Each machine boosts the energy of a beam of particles, before injecting the beam into the next machine in the sequence."

Magnets keep them on track. According to CERN, "Without any other force involved, the particles would drift apart and their momentum would carry them in a straight line. More than 50 types of magnets are needed to send them along complex paths without their losing speed."

Why are the physicists forcing the particles to collide? Why not simply observe them as they collide in nature? Do "particle accelerators" even exist in nature? Read our short article on the LHC for some help.

Yes, particle accelerators exist in the cosmos. According to NOVA, "the universe has many naturally-occurring particle accelerators that are far more powerful than the LHC, exceeding even anything we could build in the foreseeable future. Anything exotic we can create in our labs, the cosmos has beaten us to it." Cosmic particle accelerators can be found "near black holes or neutron stars, during supernova explosions and in the hot remnants those explosions leave behind."

Well, physicists do observe particle collisions in the cosmos, as much as they can. Some of the most interesting collisions take place high in Earth's atmosphere, where even the most sophisticated equipment can't catalog them directly.

We experiment with collisions because cosmic collisions are so rare and hard-to-catch. "While astronomical sources may be good accelerators, that doesn't mean the cosmos is full of good colliders. Our Earth-bound experiments are designed to focus beams of protons or other particles into tight 'bunches' . . . then send those bunches slamming into each other from opposite directions. That sort of thing is rare in space."
How rare? According to CERN, even in the controlled environment of the LHC, "The particles are so tiny that the task of making them collide is akin to firing two needles 10 kilometers apart with such precision that they meet halfway."

The Forbes article says scientists at CERN and physicists around the world will be looking for new particles. What are some examples of these exotic subatomic particles?
TEACHERS' TOOLKIT
Forbes: The Large Hadron Collider Is Back In Action

Nat Geo: 'Biggest Science Experiment in the World' Starts Up

Compact Muon Solenoid Experiment at CERN's LHC: Glossary

NOVA: The Astronomical Particle Colliders That Put Our Own to Shame

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'Biggest Science Experiment in the World' Back in Action

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SCIENCE Scientists at the Large Hadron Collider successfully turned it back on after two years of downtime. Proton beams will be accelerated, magnets will keep them on track, and the temperature will sink to almost-absolute zero. And then the fun will start. (Forbes) Use our resources to learn a little about the "biggest science experiment...

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Brazil's land clearance skyrocketed 29% in just the last year. But Google Earth has worked with the country's indigenous tribes to pinpoint destruction of the planet's largest rainforest, which produces 20% of Earth's oxygen - an effort that could be repeated elsewhere.

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Brazil's land clearance skyrocketed 29% in just the last year. But Google Earth has worked with the country's indigenous tribes to pinpoint destruction of the planet's largest rainforest, which produces 20% of Earth's oxygen - an effort that could be repeated elsewhere.