Psychologist Jean Twenge says smartphones have brought about dramatic shifts in behavior among the generation of children who grew up with the devices. Image Source/Getty Images hide caption

University of Vermont medical students in the school's new Larner classroom, built to facilitate the active learning environment. Andy Duback/Courtesy of Larner College of Medicine hide caption

Andrea Towson used heroin for more than three decades. After a near-death experience with fentanyl, she sought help. Shelby Knowles/NPR hide caption

A crash in oil prices and political instability under President Nicolas Maduro has led to food shortages. And that has prompted almost daily street protests by thousands of Venezuelans. Here opposition activists march on the Francisco Fajardo Highway in Caracas on June 19. Federico Parra/AFP/Getty Images hide caption

Zoe Kazan stars alongside Kumail Nanjiani in The Big Sick. Nicole Rivelli/Lionsgate hide caption

"If you hear the music, you don't have to be there looking at somebody's body," Sonny Rollins says. "His music is here. All the time." John Abbott/Courtesy of the artist hide caption

Kansas City musician Krystle Warren, whose forthcoming album is titled Three the Hard Way, has lived in France for nine years. Courtesy of the artist hide caption

A wooden puzzle in the silhouette of a human head might look fun if the stakes weren't so high. A doctor named Howard Knox invented The Feature Profile Test — the formal name for this puzzle —after officials struggled to administer IQ tests to immigrants because of issues with language and literacy. Stephen Lewis/Art + Commerce/Smithsonian Magazine hide caption

glass of milk Andrew Unangst/Getty Images hide caption