Why Do We Have Fingerprints?

In 1910, Thomas Jennings fled a murder scene, but he left behind a clue that would seal his fate: a perfect impression of his fingerprints in the drying paint of a railing, outside the house where he'd committed the crime. Jennings' fingerprints were the first ever to be used as evidence in a criminal investigation, and they led to his conviction for murder in 1911.

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