You’ve heard it before. Your friends just got engaged, or landed a dream job or found out they’re going to be parents, at last. “I’m so happy I could die!”

We smile at those comments and dismiss the hyperbole, but here’s the catch: Though it’s seldom life-threatening, too much happiness could kill you.

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[DIGEST: The Huffington Post, CNN]

It was May 1969, and U.S. astronauts were closer than ever before to the surface of the moon. The Apollo 10 lunar module, manned by Commander Thomas Stafford and pilot Eugene Cernan, was descending to less than 47,000 feet above the moon before completing a rendezvous with the command module, piloted by John Young. The astronauts were preparing for the giant leap for mankind that would take place two months later.

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