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UNITED STATES - APRIL 22: Marchers, including Bill Nye the Science Guy, center, lead the March for Science down Constitution Avenue in Washington on Earth Day, Saturday, April 22, 2017. Thousands of pro-science and environmental activists rallied on the National Mall before marching towards the Capitol. (Photo By Bill Clark/CQ Roll Call)

UNITED STATES - APRIL 22: Marchers, including Bill Nye the Science Guy, center, lead the March for Science down Constitution Avenue in Washington on Earth Day, Saturday, April 22, 2017. Thousands of pro-science and environmental activists rallied on the National Mall before marching towards the Capitol. (Photo By Bill Clark/CQ Roll Call)

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