https://www.sciencealert.com/one-of-the-deadliest-human-diseases-is-far-older-than-we-ever-realized
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1/10/23 at 5:00pm
Organization
ScienceAlert
Author
Clare Watson
Smallpox has left an unmistakable mark on human history, killing at least 300 million people in the 20th century alone.
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