Marchers showed up in droves to support scientists during the March for Science in Los Angeles.
Get the difference?
Participants march through the streets of Manhattan during the March for Science in New York City.
A man holds up his sign on the Boston Common during the March for Science in Boston, Massachusetts.
Rallying in Seattle
Brian Ehlert from Woodinville, Washington, joins others for a rally prior to the March for Science at Cal Anderson Park in Seattle, Washington, on April 22, 2017.
Marching in Silicon Valley
People gathered in Silicon Valley for the March for Science, many holding signs to call attention to the realities of climate change.
Marchers in "brain hats" pose on the National Mall in Washington, D.C.
Thanks to science
The March for Science in New York City started in Columbus Circle and ended in Times Square.
March participants called on government officials to support and safeguard science.
In the nation's capital
Scientists and supports gather on the National Mall in Washington, D.C.
Sea of signs
A sea of marchers and signs flood the National Mall.
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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.