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13: The Golden Toad Mystery, All the Things we Left on the Moon, and the Oldest Bar Joke

Let's Learn Everything!

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What Are Retro Reflectors on the Moon?

There's a great tick talk by astrallexanjor about the retro reflectors on the moon. They're an array of small specially designed mirrors that can reflect light back to their source. This allows you to measure the distance from the earth to the moon to literally millimeter accuracy. The grenades count as scientific equipment and not under like the dodgy miscellaneous category at the end yes.

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