THIS DAY IN SCIENCE: 3-dimensional electrons in 1994

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What is entropy?

What is entropy?

  There’s a concept that’s crucial to chemistry and physics. It helps explain why physical processes go one way and not the other: why ice melts, why cream spreads in coffee, why air leaks out of a punctured tire. It’s entropy, and it’s notoriously difficult to...
What Triggers a Chemical Reaction?

What Triggers a Chemical Reaction?

Chemicals are in everything we see, and the reactions between them can look like anything from rust on a spoon to an explosion on your stovetop. But why do these reactions happen in the first place? Kareem Jarrah answers this question by examining the two underlying...
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