With its antennae flicking like whips, a cockroach probes the ground. It stops when it detects an opening at the base of a wall. Even though the crack is wafer-thin, this nocturnal creature isn’t about to turn around, not when a bright light shines behind it. There are gentle puffs of air back there, too, and a scientist’s occasional nudges. Once the scientist seals the other exit, there’s only one way out. So, the desperate creature bashes its head against the crevice a couple of times. Then it pitches downward, squeezing and squirming through the tiny slit.


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