This is a calculated flood map for the city of St. Louis. Water depth goes from deep (dark blue) to shallow (white, light blue). Floodwater can come from the Illinois, Upper Mississippi and Missouri rivers, as well as from heavy local precipitation. Courtesy of Dag Lohmann/Katrisk hide caption

itoggle caption Courtesy of Dag Lohmann/Katrisk

Siri's answer to the brain-teaser question "What's zero divided by zero" generates a response that people find both funny and unnerving. NPR hide caption

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Apple's senior vice president of Internet Software and Services Eddy Cue speaks about Apple Music during the keynote at the annual developers conference. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Arturo Martinez watches his wife, Aurora Martinez, put on makeup in their San Rafael, Calif., home. She has Alzheimer's. Lynne Shallcross for NPR hide caption

itoggle caption Lynne Shallcross for NPR

Melissa Malzkuhn, director of the Motion Light Lab at Gallaudet University, suits up in motion capture to record a nursery rhyme for deaf children. Emma Bowman/NPR hide caption

itoggle caption Emma Bowman/NPR

Anna Akana, a bespectacled, 25-year-old comedian who writes, directs and stars in skits about everything from personal stories, to friendship and even dealing with anxiety, says she is sort of over YouTube. Anna Akana/Screenshot via YouTube hide caption

itoggle caption Anna Akana/Screenshot via YouTube

A Los Angeles Police Department car follows protesters as they march near the city's 77th Street police station last August. It was a protest of the fatal LAPD shooting of Ezell Ford. Mark J. Terrill/AP hide caption

itoggle caption Mark J. Terrill/AP

A glitch in the State Department's visa system has affected people around the world. Many, including athletes, workers and students, have been unable to enter the United States. Paul J. Richards/AFP/Getty Images hide caption

itoggle caption Paul J. Richards/AFP/Getty Images

Pilot Andre Borschberg of Switzerland sits aboard the Solar Impulse as a ground crew pushes the plane at the airport in Nagoya, Japan, prior to taking off for Hawaii. Toshifumi Kitamura/AFP/Getty Images hide caption

itoggle caption Toshifumi Kitamura/AFP/Getty Images