In 23 states and Washington, D.C., the nighttime driving restriction for unsupervised teens begins at midnight or later. Getty Images hide caption

Yahoo President and CEO Marissa Mayer delivers a keynote during the Yahoo Mobile Developers Conference on Feb. 18, in San Francisco. Stephen Lam/Getty Images hide caption

Non-GMO eggs. (this photo is for promo only, not for the page) Morgan McCloy/NPR hide caption

Kosovo's Malinda Kelmendi, who competes in judo, waves the country's flag in the capital city Pristina on July 29. Kosovo, which declared independence in 2008, is sending eight athletes to its first Olympic Games. Visar Kryeziu/AP hide caption

A typical apartment building in Roslyakovo. Russian President Vladimir Putin signed papers ordering the town to open its doors to the world on Jan. 1, 2015. Mary Louise Kelly/NPR hide caption

Republican presidential nominee Donald Trump attends a Sunday service at First Christian Church Council Bluffs, Iowa in January. Jae C. Hong/AP hide caption

Berkshire Hathaway Chairman and CEO Warren Buffett stands at the lectern during a Hillary Clinton campaign event in Omaha, Neb. Clinton waves in the background. Andrew Harnik/AP hide caption

Police keep watch during a protest Friday in Dallas. Ron Jenkins/AP hide caption

Drug counselor Gemma Bennet (left) explains to Rio Brown the results of forensic tests on a fragment of an Ecstasy pill he brought in for evaluation at The Loop. Lauren Frayer for NPR hide caption

Actor Bob McGrath has appeared on 45 seasons of Sesame Street. Richard Termine/Sesame Workshop hide caption