Here's some food for thought. Since the dawn of mankind about 50,000 years ago, it's estimated that more than 108 billion humans have been born. But out of all those multitudes, only a dozen people have ever set foot on the moon. (So far, anyway.)
All 12 were highly trained astronauts in NASA's Apollo program. Everyone knows about Apollo 11, the 1969 mission that saw Neil Armstrong and Edwin "Buzz" Aldrin take humanity's first, tenuous steps onto another celestial body. But what about what happened next? After Armstrong's crew returned safely home, NASA flew six other Apollo missions. Each one brought new discoveries intertwined with fresh challenges.