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Episode 544: The M&M Anomaly

Quoctrung Bui/NPR

One day we noticed something strange: a pack of Milk Chocolate M&M's weighs 1.69 ounces, but a pack of Peanut Butter M&M's weigh a tiny tiny bit less, 1.63 ounces. The two packs are the same price, but you get slightly less of the Peanut Butter M&M's! 0.06 ounces less! It turns out there is a whole weird world living down there at the third decimal place. When you pull on that little thread, lots of things start to unravel.

After today's show, you will never pop a piece of candy in your mouth and think about it the same way again.

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Copyright 2020 NPR. To see more, visit https://www.npr.org.

David Kestenbaum is a correspondent for NPR, covering science, energy issues and, most recently, the global economy for NPR's multimedia project Planet Money. David has been a science correspondent for NPR since 1999. He came to journalism the usual way — by getting a Ph.D. in physics first.