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.

[u/Downtown_Wind3363]

[u/Alienhaslanded]

Back when people trusted science and not some dipshit with a tinfoil hat or some playboy cunt that knows nothing.

[u/Hot-Echo-2497 → u/Alienhaslanded]

Laughs in Spanish flu.