America stored the design of the atomic bomb in steel filing cabinets with a million possible combinations each. A physicist with a paperclip and no permission cracked every single one.

This is the real story of how Richard Feynman — a 24-year-old physicist at Los Alamos — exposed the biggest security failure in American military history. He picked padlocks with bent paperclips. He cracked "unbreakable" Mosler safes by feeling for a flaw the manufacturer never fixed. And when one colleague used a mathematical constant as his combination, Feynman guessed it on his second try — without touching the lock.

One in five safes still had the factory default code. Scientists who calculated neutron equations for a living couldn't bother to reset a three-digit combination.

He reported the flaw. They ignored him. That same flaw exists in every password you use today.

Sources: "Surely You're Joking, Mr. Feynman!" (1985) by Richard Feynman. "Los Alamos From Below" — Caltech lecture transcript. Verified through Los Alamos National Laboratory historical archives.

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