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People holds up signs as thousands of people participate in the March for Science in San Francisco, California on April 22, 2017. Day. 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 / Josh Edelson (Photo credit should read JOSH EDELSON/AFP/Getty Images)

People holds up signs as thousands of people participate in the March for Science in San Francisco, California on April 22, 2017. Day.
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 / Josh Edelson        (Photo credit should read JOSH EDELSON/AFP/Getty Images)