Message for the White House
Gabrielle Walters, 21, poses for photographs in front of The White House before heading to the National Mall.
Marching in Munich
People march in support of scientific research during the March for Science demonstration on April 22, 2017 in Munich, Germany.
Nerds > turds
People protest in Munich, Germany, against the statements and polices of President Donald Trump and his administration that deride scientific research deemed inconvenient for Trump's political agenda.
Marching in Berlin
Participants take to the streets for the March for Science in Berlin, Germany.
We <3 experts
People gather in front of the Brandenburg Gate in support of scientific research during the March for Science in Berlin, Germany.
Marchers in Berlin, Germany, show their support for science.
Poetry in motion
This sign, inspired by Dr. Seuss, calls on the Trump administration to pay attention to and care about science.
Marchers brave the rain to participate in the March for Science in Washington, D.C.
Standing up for science
Ginny and Bob Goldberg traveled from Philadelphia to attend the March for Science in Washington, D.C. Both are former developmental biologists and Ginny said she directly benefits from science. She has chronic leukemia and is taking orphan drug that was fast-tracked to market.
Taking it to the streets
Participants march toward the United States Capitol during the March for Science in Washington, D.C.
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Denise Chow was the assistant managing editor at Live Science before moving to NBC News as a science reporter, where she focuses on general science and climate change. Before joining the Live Science team in 2013, she spent two years as a staff writer for Space.com, writing about rocket launches and covering NASA's final three space shuttle missions. A Canadian transplant, Denise has a bachelor's degree from the University of Toronto, and a master's degree in journalism from New York University.