How fireflies are beautiful — and useful

Sara Lewis studies fireflies. And it turns out they're not just a pretty flashing light on a summer night. She explains how a firefly glows -- and how humans are harnessing that glow for health and medical research (and even to make our food safer).

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How fireflies are beautiful — and useful

Sara Lewis: Os amores e as mentiras dos vaga-lumes

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How fireflies are beautiful — and useful