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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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40+ TED speakers recommend the books you need to read right now.

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As a radio host, Celeste Headlee has engaged in more than her fair share of discussions, and she has thought a lot about ways to bring out the best in a conversational counterpart. One thing she likes to say — a good conversation is like a game of catch. Huh? She explains.

Bigeye at Rapture Reef, a part of the Northwestern Hawaiian Islands Marine National Monument. Within this marine protected area, fish species can rebound. Photo by the NOAA National Ocean Service.

Given climate change, coral bleaching, ocean acidification and overfishing, it can be easy to feel depressed about our oceans. But when you look at the big picture of ocean health, good news emerges.

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Stephen Wilkes explains a technique of photography he developed to combine multiple moments into a single, breathtaking image.

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When Danish chef Thorsten Schmidt was asked to create a banquet in space, the endless tangle of restrictions helped him understand what really matters when it comes to food.

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A well-designed flag can be a thing of beauty, inspiring pledges of allegiance galore. But weirdly, bad flags can inspire passion and loyalty too, suggesting that democracy and design don’t always go together.