Education Secretary Arne Duncan (second from left) speaks with inmate Terrell Johnson, a participant in the Goucher College Prison Education Partnership. Patrick Semansky/AP hide caption

itoggle caption Patrick Semansky/AP

President Obama is the first sitting president to visit a federal prison. Kevin Lamarque/Landov hide caption

itoggle caption Kevin Lamarque/Landov

High school students in the Johns Hopkins University summer program, Engineering Innovation, compete in an annual spaghetti bridge-building competition. Above: The A'hunna Key-Lows push their bridge to the limit. Below: The Key-Lows' winning bridge shatters — but only after holding 53 pounds. Lydia Thompson/NPR hide caption

itoggle caption Lydia Thompson/NPR

Eliot Elementary in St. Louis, Mo., closed 10 years ago. The building remains empty. Tim Lloyd/ St. Louis Public Radio hide caption

itoggle caption Tim Lloyd/ St. Louis Public Radio

Cooper is known as the Swim Whisperer. He's been teaching swimming full-time since 1995. Elissa Nadworny/NPR hide caption

itoggle caption Elissa Nadworny/NPR

Head coach Po-Shen Loh (far left) and assistant coaches John Berman and Alex Zhai (far right) flank the members of the winning squad: Shyam Narayanan, David Stoner, Michael Kural, Ryan Alweiss, Yang Liu and Allen Liu. Courtesy of Po-Shen Loh hide caption

itoggle caption Courtesy of Po-Shen Loh