History

Human sexuality researchers William Masters and Virginia Johnson Masters, shown in San Francisco in 1972. AP hide caption

Former Democratic Rep. Lindy Claiborne Boggs attends the Distinguished Service Award ceremony at the Capitol in May 2006 in Washington, D.C. Chip Somodevilla/Getty Images hide caption

When Gene Krupa's orchestra was cast in 1941's Ball of Fire, trumpeter Roy Eldridge's presence was not negotiable. Express/Getty Images hide caption

In his latest book, Savage Continent, Keith Lowe takes a look at Europe in the years directly following World War II. Picador hide caption

Seasonal Ranger Mike Donahue (right) discuses the Battle of Little Bighorn with Jon Jones atop Custer Hill. Jim Kent/NPR hide caption

Judy Brewer was the country's first full-time female firefighter. John Duricka/AP hide caption

Sylvester's 1978 album Step II resulted in a couple of smash singles, "Dance (Disco Heat)" and "You Make Me Feel (Mighty Real)." Fantasy Archives hide caption

Take a tour of the Hanford site, a nuclear production complex in Richland, Wash., and you'll see the hundreds of mechanical water pressure gauges wired to the process tubes inside the core. Tour guide Paul Vinther warns that bumping these gauges could throw off the readings enough to trigger a an emergency shutdown of the reactor. Martin Kaste/NPR hide caption

President Gerald Ford finishes giving a speech on Jan. 13, 1975. Ford was born 100 years ago Sunday. Marion S. Trikosko/Courtesy of Library of Congress hide caption

William Friedman, who helped create the NSA and became its first chief cryptologist, declared the Voynich Manuscript impossible to translate. He thought it was an early example of a made-up language. Beinecke Rare Book & Manuscript Library, Yale University hide caption