Cactus spine shapes determine how they stab victims

Tests in hunks of meat revealed that some spines simply poke, while others hitch a ride

cactus spine poking a finger

THE SPINE WHO LOVED ME  Scientists are working to understand how cactus spines, like those from this brittle prickly-pear cactus (Opuntia fragilis), puncture their victims so easily.

John Trager

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