Myths obscure the truth of two pioneering flights. Charles Lindbergh was far from the first man to fly the Atlantic. The biggest danger astronaut John Glenn faced wasn't a problem with his heat shield during reentry but on the launch pad.

Did an alien spaceship crash in Roswell, New Mexico in 1947? Are scientists reverse-engineering extraterrestrial technology in the Nevada desert's Area 51? Conspiracy theorists have no doubts. But the facts tell a very different story.