While teaching physics at Princeton University in 1969, Gerard K. O'Neill asked his students to design large, theoretical structures suitable for space. Their proposals led him to publish the first concept for what came to be known as the "O'Neill cylinder" in 1974 in Physics Today and to revisit the idea in his book, The High Frontier. O'Neill's design incorporates areas for human habitation, farming, and manufacturing. What feature allows occupants to experience gravity?
Back in the day
Ned Kelly is Australia's most famous bushranger and, to many, a folk hero who defied colonial authorities. Ned's trouble with the law began when he was just a teen, and what started as minor scrapes with authorities escalated into more serious crimes, including the bank robberies and murders that eventually led to his execution. Despite Kelly's misdeeds, many believe that he and his family were unfairly targeted by police. In its last stand, the Kelly gang utilized "body armor" made out of what?
Born on a day like today
Henry VIII, the second monarch of the Tudor dynasty, was King of England from 1509 until his death in 1547. He was and is famous for having been married six times and for having wielded the most unfettered power of any British monarch. Notable events during his reign include the break with Rome and subsequent establishment of the independent Church of England, the Dissolution of the Monasteries, and the union of England and Wales. Who were Henry's six wives?