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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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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. Still, more than 70 years after Grand Rapids, Michigan, became the first city to fluoridate its drinking water, the practice remains controversial. Some worry that fluoridated drinking water can lead to health issues, but what is the scientific consensus? (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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What makes skunk spray smell so awful? And how can you get rid of the smell? It’s all in the chemistry! (3:50 min.)

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