In 1979, six-year-old Etan Patz disappeared while walking to his bus stop in New York City. He was the first missing child whose photo appeared on a milk carton.
In late December 1978, 9-year-old Lena Zakotnova was on her way home in Shakhty, Russia, when she was seen with an older man in a long dark coat. To anyone watching, it may have looked like an ordinary moment. Instead, it led to one of the most horrifying child cases in Soviet criminal history.
From 1991 to 1993, eight people sealed themselves inside a giant glass-and-steel closed world in the Arizona desert to test if humans could live in a self-sustaining habitat. The project was often framed as a prototype for a Moon or Mars colony.