(Approximately) 10 Things That Vanished Mysteriously

Sometimes things - like dentures, airplanes or even people - go missing. And when they never turn up again they become enduring, and engrossing, mysteries.

How Blimps Work

After newsreels captured the Hindenburg erupting in fire in 1937, the promising development of airship aviation was cut short. Today companies and militaries are taking another look at blimps and the unique qualities that may revive them.

The U.S. Navy has a pretty cool history of tapping the hive mind to solve problems, beginning with the loss of the USS Scorpion, a nuclear submarine, in June 1968. The Scorpion set out for Norfolk, Virginia from a base in Spain but never showed up and an extensive search was launched but yielded nothing. It's now thought that the Soviets sunk her.