Flies navigate using complex mental math

The treadmills in Rachel Wilson's laboratories at Harvard Medical School aren't like any you'll find at a gym. They're spherical, for one, and encased in bowling ball–sized plastic bubbles. They're also built for flies.

Plant immune proteins trigger cell death

Plant cells self-destruct to survive. After detecting a pathogen, they set off a chain reaction that ultimately destroys them, preventing disease from spreading.

Flexible 'slinkies' form in DNA of archaea

New cryo-electron microscopy images suggest archaeal microbes pack their chromatin into tight coils that can spring open, forming unexpected contortions.

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