Environmentalist John Francis speaks about the 17 years of his life during which he never spoke a word. Andrew Heavens/Courtesy of TED hide caption

itoggle caption Andrew Heavens/Courtesy of TED

"I began to learn at least what other people felt and what they wanted to say before cutting them off with my own diatribe. I used to do that." - John Francis Andrew Heavens/TED hide caption

itoggle caption Andrew Heavens/TED

"Clouds are the most egalitarian of nature's displays 'cause we all have a great view of the sky" - Gavin Pretor-Pinney James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

"I think all this tidiness isn't doing us any good. It just spills out anyway" — Sarah Jones James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

This is a re-creation of a color plate from Interaction of Color, by Josef Albers. The two X's are are exactly the same — it's the different backgrounds that make them look like very different colors. Source: Josef Albers Interaction of Color hide caption

itoggle caption Source: Josef Albers Interaction of Color

The "Aroma R-evolution" kit comes with four forks and 21 vials full of aromas like olive oil, mint and smoke. You drop a dab of scented liquid onto the base of the fork, and the smell is supposed to subtly flavor the food you eat while using the utensil. Claire Eggers/NPR hide caption

itoggle caption Claire Eggers/NPR

After a hard day of bruising battle, ancient gladiators reached for a post-workout drink, according to an ancient account. New research backs that up. Stefano Bianchetti/Corbis hide caption

itoggle caption Stefano Bianchetti/Corbis

"We have a whole lot of power over what lives or dies on this planet and we have to think very carefully about what that means and how we're using it." -Juan Enriqez James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED