When a 40year old Ohio man named John fell in the bathroom and hit his head on the tub, no one expected it to change how the entire world approached space exploration. But John Glenn wasn't just a business traveler in a hotel room, and the medical mystery that followed changed NASA and the space program of the USSR.

Was John Glenn's vertigo the result of his orbit of the Earth during his Mercury Atlas 6 mission? Was it all just an accident, or did it come from his intense World War II and Korean War pilot service? And could the balance, dizziness, and nausea be prevented for future astronauts?

The resulting research into what went wrong with John Glenn, Alan Shepard, and other astronauts and cosmonauts who experienced debilitating illnesses after spaceflight pioneered the spaceflight to the Moon and beyond and it all started when a man slipped on a rug.

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