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Entropy is a concept that’s crucial to chemistry and physics. It helps explain why physical processes go one way and not the other. (5:19 min)

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One of the most amazing facts in physics is that everything in the universe, from light to electrons to atoms, behaves like both a particle and a wave at the same time. But how did physicists arrive at this mind-boggling conclusion? Learn how in this video. (4:51 min.)

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Look, up in the sky, it's a particle! It's a wave! Actually it's both. It's light! In this video learn about wave-particle duality and the photoelectric effect.(3:55 min.)

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As a pilot, Shane is responsible for flying helicopters and for their upkeep. He is also a ground instructor responsible for teaching helicopter students ground school classes.

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Learn more about the organic chemistry going on beneath the surface of thousands of precious paintings around the world. (3:54 min.)

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Learn about how and why we itch. (4:43 min.)

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Your smartphone, tablet and other devices emit large quantities of blue light wavelengths. This tells your body "wake up!" when you should be getting ready to sleep. (2:50 min.)

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It’s in our tap water, toothpaste and even in tea. Fluoride has helped reduce cavities in children for decades but some worry that fluoridated drinking water can lead to health issues. What is the verdict of the scientific community? (3:14 min.)

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Here’s a conundrum: Identical twins originate from the same DNA ... so how can they turn out so different — even in traits that have a significant genetic component? (5:02 min.)

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Fuel cells may be a major energy source of the future, but how do they work? Also addressed are the current and future possibilities for this technology. (4:01 min.)

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