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Is it 5? Or could it be as high as 11? Or as few as 3? How is the fossil record used to make this determination and how could how the record is interpreted affect our conclusions? (3:21 min.)

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70% of all the freshwater on Earth is frozen. If it all melted the habitat of polar bears and walruses would disappear. It would also raise sea level 70 meters. Learn what effects this would have on the people of Earth. (5:50 min.)

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Have you ever wondered why water is clear in a glass but blue in our lakes and swimming pools? It's all about the spectrum of light! We break it down. (2:50 min.)

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We all know that acquired traits can not be passed on to future generation..right? Wrong! More and more evidence indicates that external factors can affect gene expression and this can be passed onto offspring. (2:47 min.)

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When it comes to climate change predictions, clouds are a pain in the butt. In fact, according to the IPCC, they’re the largest pain in the butt. They’re pretty squirrelly things: small, fast, and variable in shape, size and behavior, which makes them really challenging for climate scientists to work with. Clouds also have a big impact on the climate — and could potentially make the effects of climate change much worse. (2:53 min.)

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Robin Bulleri tells the story of Henrietta Lacks, a woman whose DNA led to countless cures, patents, and discoveries. (4:26 min.)

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Ever wonder who works with nanotechnology? Check out how one entrepreneur is using nanotechnology in their business.

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Statistics are persuasive. So much so that people, organizations, and whole countries base some of their most important decisions on organized data. (4:18 min.)

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Salt dissolves in water; oil does not. But why? (5:02 min.)

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The elephant is a creature of epic proportions — and yet, it owes its enormity to more than 1,000 trillion microscopic cells. Why don’t we get unicellular elephants? Or blue whales? Murry Gans explains. (4:06 min.)

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