Some 80 to 90 percent of undersea creatures make light — and we know very little about how or why. Deep-sea biologist Edith Widder explores this glowing, sparkling, luminous world, sharing glorious images and surprising insight into the unseen depths (and brights) of the ocean. (Recorded on the Mission Blue Voyage, April 2010 on the National Geographic Endeavor, the Galápagos Islands, Ecuador. Duration: 17:20)
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