Take a look at some of the important moments in birth control history.
1920s -- Scientists working independently in Japan and Austria devise the "Rhythm Method" of birth control after figuring out that women are fertile approximately midway through the average menstrual cycle. They conclude pregnancy can be avoided by abstaining from sex during that period.
Marek Szczepanek/Wikimedia Commons
Larry Busacca/Getty Images
Warner Bros. Television
HRH The Duchess of Cambridge via Getty Images
iStock / MartiSaiz
Andrew H. Walker/Getty Images
Adele.com via CNN
National Nuclear Security Administration
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