As with many industries, science has a woman problem. Only around 30 percent of researchers around the world are women according to UNESECO, and those who do work in science, technology, engineering and mathematical (STEM) fields are often paid less than their counterparts.
Women who excel in STEM subjects defy the odds stacked against them. To mark International Women's Day, let's take a look at just a handful of women who have changed our world for the better.
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