生物发光

Ocean explorer Edith Widder shares the astoundingly sophisticated language of bioluminescent creatures, which can light up the depths of the seas like a “snow storm.”

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).