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Activists and protesters march to City Hall during the March for Science in Los Angeles, California on April 22, 2017. Thousands of people joined a global March for Science to fight back against what many see as an "assault on facts" by populist politicians. / AFP PHOTO / Mark RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)

Activists and protesters march to City Hall during the March for Science in Los Angeles, California on April 22, 2017.
Thousands of people joined a global March for Science to fight back against what many see as an "assault on facts" by populist politicians. / AFP PHOTO / Mark RALSTON        (Photo credit should read MARK RALSTON/AFP/Getty Images)