Demonstrators hold placards during the "March for Science Stockholm" manifestation at Medborgarplatsen square in Stockholm, Sweden. TT News Agency/Marc Femenia/via REUTERSShow moreShow less
Demonstrators march to the U.S. Capitol during the March For Science in Washington, U.S., April 22, 2017. REUTERS/Aaron P. Bernstein Show moreShow less
Demonstrators attend the March for Science rally on Earth Day, in Santiago, April 22, 2017. REUTERS/Ivan AlvaradoShow moreShow less
Mary Devine of Levittown, Long Island looks on during the Earth Day 'March For Science NYC' demonstration to coincide with similar marches globally in Manhattan, New York, U.S., April 22, 2017. REUTERS/Andrew KellyShow moreShow less
Demonstrators gather at the Washington Monument before marching to the U.S. Capitol during the March for Science in Washington, U.S., April 22, 2017. REUTERS/Aaron P. BernsteinShow moreShow less
Demonstrators gather as they participate in the March for Science rally on Earth Day, in Santiago, April 22, 2017. REUTERS/Ivan AlvaradoShow moreShow less
A demonstrator rides the carousel at the March for Science rally on the Common in Boston, Massachusetts, U.S., April 22, 2017. REUTERS/Brian SnyderShow moreShow less
Demonstrators march to the U.S. Capitol during the March for Science in Washington, U.S., April 22, 2017. REUTERS/Aaron P. BernsteinShow moreShow less
A protester dressed as U.S. president Donald Trump pretends to play golf with the Earth during the Earth Day 'March For Science NYC' demonstration to coincide with similar marches globally in Manhattan, New York, U.S., April 22, 2017. REUTERS/Andrew KellyShow moreShow less
Demonstrators march down Commonwealth Avenue from Massachusetts Institute of Technology (MIT) to the March for Science rally on the Common in Boston, Massachusetts, U.S., April 22, 2017. REUTERS/Brian SnyderShow moreShow less
A demonstrator wears an Albert Einstein image at the March for Science rally on Earth Day, in Santiago, April 22, 2017. REUTERS/Ivan AlvaradoShow moreShow less
Volunteers hold their fists in the air during the March For Science in Seattle, Washington, U.S. April 22, 2017. REUTERS/David RyderShow moreShow less
Women dressed as witches join the March for Science rally on the Common in Boston, Massachusetts, U.S., April 22, 2017. REUTERS/Brian SnyderShow moreShow less
Bill Nye leads demonstrators on a march to the U.S. Capitol during the March for Science in Washington, U.S., April 22, 2017. REUTERS/Aaron P. BernsteinShow moreShow less
A protestor holds a sign in support of science during the March For Science in Seattle, Washington, U.S. April 22, 2017. REUTERS/David Ryder Show moreShow less
Demonstrators gather for the March for Science rally on the Common in Boston, Massachusetts, U.S., April 22, 2017. REUTERS/Brian SnyderShow moreShow less
A protestor, who attempted to disrupt the official rally program, is detained by police officers during the March For Science in Seattle, Washington, U.S. April 22, 2017. REUTERS/David RyderShow moreShow less
Earth Day: Celebration of evidence-based knowledge
Thousands of scientists and people from other walks of life turned out for Earth Day events