Image via NASA on Flickr

Pop quiz, hot shot! Who was the youngest person to walk on the Moon? Hint: it’s his birthday today. (Yes, obviously it’s a man.)

Charles “Charlie” Duke was the Lunar Module Pilot for Apollo 16. He was the tenth man and at 37 the youngest man to walk on the Moon.

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He was also the CAPCOM (Capsule Communicator) for Apollo 11 so if you’ve heard the audio of the landing it’s his voice after Neil Armstrong announced the Eagle had landed that said “Roger, Twank... Tranquility, we copy you on the ground. You got a bunch of guys about to turn blue. We’re breathing again. Thanks a lot!”

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As backup Lunar Module Pilot for Apollo 13 he was the one who caught German measles and caused Ken Mattingly to be bumped from the mission. Mattingly ended up being the Command Module pilot on Apollo 16 along with Duke with John Young as Mission Commander.