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Showing posts with label century. Show all posts

Showing posts with label century. Show all posts

New Dye was Adopted Quickly in the 18th Century

Despite this being a "scientific"age, not everything is known about the technology of the past. New research shows that adoption...

The Aim Is to Eradicate Polio

Smallpox was a serious problem in the 20th century. The World Health Organization declared in 1979 that smallpox was no longer a danger to ...

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