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Why are most manhole covers round? Sure it makes them easy to roll, and slide into place in any alignment. But there’s another, more compelling reason. (3:34 min.)

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When it comes to what you bite, chew and swallow, your choices have a direct and long-lasting effect on the most powerful organ in your body: your brain. So which foods cause you to feel so tired after lunch? Or so restless at night? Mia Nacamulli takes you into the brain to find out. (4:52 min.)

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Ever go to pour ketchup on your fries...and nothing comes out? (4:28 min.)

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If you look through your glasses, binoculars or a window, you see the world on the other side. How is it that something so solid can be so invisible? (4:07 min.)

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There's a lot of talk these days about when and how we might all move to Mars. But what would it actually be like to live there? (4:29 min.)

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Bill Nye explains the threats that different sizes of asteroids can pose to life on Earth, how we can detect them, and ways that we can protect Earth from those asteroids. (7:07 min.) Learn more about asteroids at http://www.space.com/51-asteroids-formation-discovery-and-exploration.html.

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This clip compares vascular and nonvascular plants before jumping into several plant adaptations. (8:40 min.)

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Eden's Education Team talk about the many ways that plants in the rainforest have adapted to succeed in a challenging habitat. (7:40 min.)

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A stunning animation, showing the variety of cell types that exist within and around us. Travel through a virtual world and learn about the different stages of the cell cycle. (5:34 min.)

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Bill Nye follows the development of the theory of Plate Tectonics by looking at the evidence for the mechanism that moves the plates and provides support for this theory.(4:07 min.)

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