James Duncan Davidson/TED
Marla Aufmuth/TED

Switchtracking, as defined by author Sheila Heen, is when "someone gives you feedback, and your reaction to that feedback changes the subject." Hanna Barczyk for NPR hide caption

itoggle caption Hanna Barczyk for NPR

"[Phones are] really a magic portal that allows you to go into another dimension of space and time." — Amber Case James Duncan Davidson/TED hide caption

itoggle caption James Duncan Davidson/TED

"I don't want you in the frame. I don't want you in the window. I want you through the window. I want you on the other side, in the world, inhabiting the world." — Chris Milk Bret Hartman/TED hide caption

itoggle caption Bret Hartman/TED

Lily chases sheep for the first time in her shepherd-mix life, at Raspberry Ridge Sheep Farm in eastern Pennsylvania. Several times a year the farm invites dogs for "herding instinct tests." Fred Mogul/WNYC hide caption

itoggle caption Fred Mogul/WNYC
Drawn Ideas/Ikon Images/Corbis
Gary Waters/Ikon Images/Getty Images

Renowned British neurologist and author Oliver Sacks, pictured in London in 1983, died Sunday of cancer. He was 82. United News/Popperfoto/Getty Images hide caption

itoggle caption United News/Popperfoto/Getty Images

Male treehoppers make their abdomens thrum like tuning forks to transmit very particular vibrating signals that travel down their legs and along leaf stems to other bugs — male and female. Courtesy of Robert Oelman hide caption

itoggle caption Courtesy of Robert Oelman

A group of British researchers has a hunch that once ancient humans learned to cook, starchy foods like root vegetables or grasses could have given them a calorie bump that fueled the evolution of the human brain. Scott Sherrill-Mix/Flickr hide caption

itoggle caption Scott Sherrill-Mix/Flickr

Daniel Craig plays James Bond in the film Casino Royale. Dramatis, a computer program, can detect suspense from this scene and rates it even higher as the plot thickens. MGM/United Artists/Sony/The Kobal Collection hide caption

itoggle caption MGM/United Artists/Sony/The Kobal Collection