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Have you ever looked at a lake and wondered why there was a thick layer of green scum on the water? Chances are, you were looking at an eutrophic lake.

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

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Animal agriculture is a big source of methane emissions. That’s right—this powerful greenhouse gas is being produced by cows!

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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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Looks at how the densities of the materials that make up the Earth have resulted in its layered structure. Also addresses how we know these layers exist. (4:51 min.)

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Scientific discovery isn't as simple as one good experiment. The weird and wonderful history of cell theory illuminates the twists and turns that came together to build the foundations of biology. (6:11 min.)

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Venomous snakes are not only dangerous, but also fascinating because their venom holds clues to medical discoveries that can save human lives.

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Henrietta Lacks was a poor African-American tobacco farmer from Virginia. When her cells were collected by medical researchers after her death in 1951, it changed the future of medicine.

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Isotopes are a lot like a foreign language. Once you know how to interpret them, you can learn a lot more about the world around you.

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When you eat something loaded with sugar, your taste buds, your gut and brain all take notice. This activates a reward system not unlike how our bodies process addictive substances such as alcohol or nicotine - dopamine levels spike and you crave more. (5:02 min.)

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