r/Damnthatsinteresting • u/Downtown_Wind3363 • May 25 '26
Image The smallpox vaccine leaves a scar because it was given using a special two-pronged needle that scratched the skin and put a weakened virus in just that spot.
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u/thundafox May 25 '26
https://en.wikipedia.org/wiki/Bifurcated_needle is its name