Horses, riders and runners crossed three streams in the course of their 22-mile race through the hills of central Wales. The average finish time was the same for both species — four hours. Ryan Kellman and Adam Cole/NPR's Skunk Bear hide caption

itoggle caption Ryan Kellman and Adam Cole/NPR's Skunk Bear

Cesar Kuriyama explains his app 1 Second Everyday at TED. James Duncan Davidson/Courtesy of TED hide caption

itoggle caption James Duncan Davidson/Courtesy of TED

Psychologist Laura Carstensen explains why growing older also means growing happier for so many people. Michael Priest Photography/Courtesy of TED hide caption

itoggle caption Michael Priest Photography/Courtesy of TED

Theoretical Physicist Sean Carroll asks why does time exist? Marla Aufmuth/Courtesy of TED hide caption

itoggle caption Marla Aufmuth/Courtesy of TED

"Human beings are works in progress that mistakenly think they're finished," says psychologist Dan Gilbert. Ryan Lash/Courtesy of TED hide caption

itoggle caption Ryan Lash/Courtesy of TED

Joy (left, voiced by Amy Poehler) and Sadness (voiced by Phyllis Smith) catch a ride on the Train of Thought in Pixar's Inside Out. The movie opens in theaters nationwide June 19. Disney/Pixar hide caption

itoggle caption Disney/Pixar

TED Prize winner Dave Isay speaks at TED2015. Bret Hartman/Courtesy of TED hide caption

itoggle caption Bret Hartman/Courtesy of TED

Artist Honor Harger says Jupiter sounds like "ocean waves breaking up on the beach." Robert Leslie/Courtesy of TED hide caption

itoggle caption Robert Leslie/Courtesy of TED

TED Radio Hour

Honor Harger: What Does Space Sound Like?

Sound artist Honor Harger spent the last few years listening to the stars and recording some of the sounds of space.

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"We can harness our bodies' own abilities that are kind of kept under wraps to allow the aging process to be slowed down." - Biochemist Cynthia Kenyon James Duncan Davidson/Courtesy of TED hide caption

itoggle caption James Duncan Davidson/Courtesy of TED

Medical ethicist Harvey Fineberg says "neo-evolution" is on the horizon. James Duncan Davidson/Courtesy of TED hide caption

itoggle caption James Duncan Davidson/Courtesy of TED

"[Trust is] the willingness to sacrifice for another human being." — Simon Sinek James David Duncan/Courtesy of TED hide caption

itoggle caption James David Duncan/Courtesy of TED

These robotic arms are part of a modular kitchen that's been set up so that the robot chef can find exactly what it needs. Moley Robotics hide caption

itoggle caption Moley Robotics

Psychologist Abraham Maslow was a pioneer in positive psychology, envisioning what was right with his clients, rather than what was wrong. Corbis hide caption

itoggle caption Corbis

Psychologist Mihaly Csikszentmihalyi says we can achieve one of our most elusive needs, self-actualization, by seeking moments of "flow." Asa Mathat/TED hide caption

itoggle caption Asa Mathat/TED