Taggert Sabo and his friends took turns scribbling equations on a white board in a University of South Florida study room last spring. They needed to work out a confusing proof for a take-home test, ...

James A. Lovell Jr., the American astronaut who commanded the Apollo 13 spacecraft on its lunar voyage in 1970 and shepherded it on a perilous four-day journey back to Earth after an oxygen tank ...