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Showing posts with label
century
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Show all posts
Showing posts with label
century
.
Show all posts
New Dye was Adopted Quickly in the 18th Century
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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
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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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