Conall Spaur from Howell, N.J., holds a sign while waiting in line for a teach-in on climate change at the March for Science event in Washington, Saturday, April 22, 2017. Thousands of scientists worldwide left their labs to take to the streets Saturday along with students and research advocates in pushing back against what they say are mounting attacks on science. (AP Photo/Sait Serkan Gurbuz)
Featured Photo Galleries
