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Author - Laura Hamilton Waxman

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What space objects can have millions of times more mass than our Sun, but they remain invisible? Black holes!

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Author - Laura Hamilton Waxman Create an Epic account to start reading! What space objects can have millions of times more mass than our Sun, but they remain invisible? Black holes! Read this Book on Epic!

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Geometric Constructions ... Animated!

"Construction" in Geometry means to draw shapes, angles or lines accurately.

These constructions use only compass, straightedge (a ruler, but not using the numbers) and a pencil.

This is the "pure" form of geometric construction: no numbers involved!

Basics

Learn these two first, they are used a lot:

Points and Lines

Angles

And it is useful to know how to do 30°, 45° and 60° angles. We can use the angle bisector method (above) to create other angles such as 15°, etc.

Triangle Basics

Triangle Centers

Circle Basics

Circles and Tangents

Polygons

And for the "Master Class":

(Note: You can also see how to Use the Drafting Triangle and Ruler, Use the Protractor, and How to construct a Triangle With 3 Known Sides, but they are not "pure" geometric constructions.)

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

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Read The Heart: A Graphic Novel Tour on Epic

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Author - Joeming Dunn , Illustrator - Rod Espinosa

Illustrator - Rod Espinosa

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Travel into the circulatory system, through the heart, and out to the body to learn how the heart pumps blood through the body.

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online access fun thousands children great kids ebooks books

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Read The Heart: A Graphic Novel Tour on Epic

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Author - Joeming Dunn , Illustrator - Rod Espinosa Illustrator - Rod Espinosa Create an Epic account to start reading! Travel into the circulatory system, through the heart, and out to the body to learn how the heart pumps blood through the body. Read this Book on Epic!

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Instantly access The Heart and Lungs plus over 40,000 of the best books & videos for kids.

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thermal energy, internal energy present in a system in a state of thermodynamic equilibrium by virtue of its temperature. Thermal energy cannot be converted to useful work as easily as the energy of systems that are not in states of thermodynamic equilibrium. A flowing fluid or a moving solid, for example, possesses energy that can be converted to work in some mechanical device, such as a windmill or a waterwheel, but the same fluid or solid in a thermodynamic equilibrium state having the same energy (as thermal energy) can do no work unless it is combined with another substance at a different temperature, as in a heat engine.

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thermal energy, internal energy present in a system in a state of thermodynamic equilibrium by virtue of its temperature. Thermal energy cannot be converted to useful work as easily as the energy of systems that are not in states of thermodynamic equilibrium.

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RUBY: Hey dude, mind if I change the channel?

NIC: What? Uh.. Yeah, Yeah, I'm in the middle of a game right now

RUBY: But I really wanna try out my new time-warp controller.

NIC: Wai- Wait a second, your what?

RUBY: My new time-warp controller. Apparently, it lets you time travel through video games. I got it for two bucks from the op shop.

NIC: Yeah... I'm sure it does.

RUBY: I'll show you. So, you're playing some car racing game from this year, but if we take it back to say, 2000, you get something like this.

NIC: Ah, old school.

RUBY: You think that's old school? Let's go back to 1995.

NIC: Oh yuck. Am I, the grey pixel or green pixel?

RUBY: What about the 1980s when the first handheld device was invented!

NIC: Oh, I remember having one of these!

RUBY: alright, enough of this high-tech business. Let's go back to the first ever video game.

That's going to take a bit of detective work. To find out about the early days, I had a chat to Simon Wisbey.

RUBY: G'day, I'm Ruby.

SIMON: Hi Ruby, I'm Simon.

He's a video game expert who's been in the business a long time.

SIMON: Come through and I'll show you some games!

RUBY: Yeah, cool, let's do it

RUBY: So, Simon, what were early video games like?

SIMON: Really simple Ruby. They were just black and white, very simplistic, minimum sound.

Do you recognise this game? You might know it as naughts and crosses, but the original version from 1952 was called OXO. An English computer scientist named Alexander Douglas invented it as part of a university project showing how people and computers could interact. In 1958, this slightly more complicated game, Tennis For Two was released. As you can see, still not the most exciting graphics. But in the 1980s, it was made famous, when it became an arcade video game. It's still one of the most popular of all time.

RUBY: So how is it that video games made it onto the arcade scene?

SIMON: Well that's really interesting Ruby, we saw that sorta start happening in the early 80s, where all the fish and chip shops and all the little takeaway stores, chicken shops used to have a pinball and an arcade game. Then they started making dedicated arcades, and that's where you saw arcades just wall-to-wall full of video games, pinball machines, driving simulators. It was huge!

But like all good things, that came to an end. As games came out that you could play at home on the couch, fewer people felt the need to visit arcades. But that doesn't mean it's game over for all these machines! Simon says they're back in fashion.

RUBY: Okay I have one more question. Can we play a game?

SIMON: Absolutely. You pick it.

NICK: Aw man, another tie, that was so close. This game is so underrated!

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History of Video Games - Behind The News

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Hi BTN, this is Mini here. I've got a question. What was the first ever video game, who created it and why?

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Read National Geographic Readers: Titanic on Epic

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online access fun thousands children great kids ebooks books

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Read National Geographic Readers: Titanic on Epic

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Instantly access National Geographic Readers: Titanic plus over 40,000 of the best books & videos for kids.

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Did Spinosaurs live in the water? - Newsela

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Did Spinosaurs live in the water? - Newsela

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Newsela is an Instructional Content Platform that supercharges reading engagement and learning in every subject.

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Newsela | Astronomers find closest black hole to Earth, hints of more

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European astronomers find the closest black hole to Earth yet, and it comes with two visibly dancing stars.