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TIL that an audio recording of a lock being opened provides enough data to reproduce the key required to open that lock, even with a cell phone's microphone.

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P1e1g TIL: birds exhibit very jerky movements mainly for depth perception — quickly switching which eye is looking at something enables comparison between viewpoints, much like humans constantly compare views from their two eyes which the brain uses to create a 3D picture.
KODVQ TIL of Jānis Pīnups. Presumed killed in World War II, he deserted the Red Army. To avoid being caught, he hid in the forest until 1995, constructing bunkers to hide in. Only his siblings knew he was alive, and he helped them gather forest mushrooms and berries under the cover of night.
VLwm TIL that Hitler, after a total war economy was instituted in 1943, had the women’s cosmetics industry gradually closed down rather than banned outright to avoid upsetting Eva Braun.
wopDP TIL that beneath Grand Central Terminal in NYC lies a massive hidden basement called M42, which was once a WWII target. It remained secret for decades and is large enough to fit two football fields, housing key equipment for powering the terminal.
N7bXe TIL the last known member of a species is called an "endling."