Mental Floss

How Do Pregnancy Tests Work?

Yelena Melnichenko
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Ever wonder what the very first pregnancy test was like? Or how, exactly, home kits work? Or—most important of all—how reliable they really are?

Look no further than this easy-to-understand (and visually entertaining) TEDEd video by Tien Nguyen, which explains the history of, and the science behind, these all-important plastic indicators. 

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