Thousands of protesters fill Tom McCall Waterfront Park during the March for Science in Portland, Oregon, on Saturday, April 22. Protests were held in cities around the world against President Donald Trump's policies.
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Thousands participate in the National March for Science in Rome, Italy, on Earth Day.
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A woman wears a brain beanie during the March for Science in Portland.
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People show support of scientific research in Berlin, Germany, residents march behind a sign that reads, "There are no alternatives to facts."
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Scientists and science enthusiasts march in London.
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Marchers gathered in front of the Brandenburg Gate in Berlin. Similar marches drew people in more than 500 cities around the world.
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Marchers at the Paris March for Science holding signs. In addition to Paris and Berlin, marches were schedued in Rio, Munich, San Francisco, Boston, Oklahoma City and Bratislava, Slovakia.
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Scientists at the Neumayer Station in Antarctica take part in the March for Science on April, 22.
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Marching in support of scientific research in Berlin, Germany. Many of the marches featured music and speeches.
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A woman in Vienna, Austria,attends the March for Science there. In the US, many marchers have been galvanized by President Donald Trump's proposed cuts to scientific research, including slashing $5.8 billion from the budget of the National Institutes of Health.
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Researchers and scientist protest against budget cuts during the March for Science in Madrid, Spain.
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People stand together in Martin Place, in Sydney, Australia,for the city's international March for Science.
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Scientists and science enthusiasts gather prior to the start of the March for Science in central London.
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Members of the Union for Concerned Scientists with Muppet character Beaker protest in front of The White House in Washington D.C., before heading to the National Mall for the March for Science.