see more

People hold signs during 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 hold signs during 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)