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Why does fashion repeat in 20-year cycles? Math has the answer

A mathematician analyzed 150 years of women’s fashion to understand 20-year trend cycles, and how “optimal distinctiveness” drives change.

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May 15, 2026

In the microgravity of space, tumors can triple in size in just 10 days. That could be a boon for cancer research, and a risk for astronauts. Plus, why are appliances playing elaborate tunes, and where do they come from? And, beavers and humans tend to clash over landscape management. Pixar's “Hoppers” captures the struggle, and Oregon proves coexistence is possible.

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Video

A Peek at the Possibilities of Biodesign

An air purifier filled with spider webs, a toilet insert that filters estrogen, a cactus-like water harvester—these were just a few of the ambitious and creative ideas presented at the first Biodesign Challenge, which took place on June 23, 2016.

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