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In London, the march route went past the city’s most celebrated research institutions. Participants carried signs showing images of a double helix and chemical symbols.

In Geneva, marchers held signs that said, “Science – A Candle in the Dark” and “Science is the Answer.”

\"PHOTO:
Daniel Leal-Olivas/AFP/Getty Images
PHOTO: Scientists and science enthusiasts gather prior to the start of the March for Science outside the Science Museum in central London, April 22, 2017.
>

Berlin saw several thousand people march from one of the city’s universities to the Brandenburg Gate.

\"We need to make more of our decisions based on facts again and less on emotions,\" Meike Weltin, a doctorate student at an environmental institute near the German capital, told The Associated Press.

\"PHOTO:
Markus Schreiber/AP Photo
PHOTO: A woman with a poster attends with thousands of other demonstrators the March for Science in Berlin, April 22, 2017.
>

The idea for a March for Science began on social media after U.S. President Donald Trump's inauguration in January.

Within weeks, organizers said, the concept went viral, with hundreds of marches being organized worldwide and thousands of volunteers offering assistance, all in an effort to get scientists out of their labs and onto the streets along with students, teachers and research advocates. The movement’s Facebook page has garnered nearly 550,000 likes.

“Science protects the health of our communities, the safety of our families, the education of our children, the foundation of our economy and jobs, and the future we all want to live in and preserve for coming generations,” organizers say on the March for Science website. “We speak up now because all of these values are currently at risk. When science is threatened, so is the society that scientists uphold and protect.”

The Associated Press contributed to this report.

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