1. Thousands of scientists and the people who support them took to the streets around the world on April 22, 2017.
March for Science demonstrators in Boston. Photo by Scott Eisen/Getty Images.
2. The day (not-so) coincidentally happened to be Earth Day.
Demonstrators in Boston. Photo by Scott Eisen/Getty Images.
3. Varied were the messages on their signs and the chants rolling off their tongues. But one truth stayed consistent everywhere: They are not happy with President Trump.
Demonstrators rally outside Trump Tower in New York City. Photo by Bryan R. Smith/AFP/Getty Images.
4. The March for Science, officially held in Washington, D.C., expanded to over 600 satellite marches around the world.
March for Science demonstrators in Washington, D.C. Photo by Jessica Kourkounis/Getty Images.
5. From Berlin to London ...
Demonstrators in London. Photo by Daniel Leal-Olivas/AFP/Getty Images.
6. ... and Boston to New York City.
Demonstrators in New York City. Photo by Bryan R. Smith/AFP/Getty Images.
7. People rallied in favor of evidence and research — and against Trump's unabashed disregard for scientific facts.
Demonstrators in San Francisco. Photo by Matt Savener.
8. Consolidating all the issues into a single page would be quite a difficult task, honestly.
Demonstrators in New York City. Photo by Carly Gillis.
9. But through their signs and slogans, many marchers singled out the president's indifference to climate change ...
Demonstrators in London. Photo by Daniel Leal-Olivas/AFP/Getty Images.
10. ... his alarming proposed budget cuts to science and research funding ...
Demonstrators in London. Photo by Daniel Leal-Olivas/AFP/Getty Images.
11. ... and his administration's general fondness for, um, "alternative facts" as the major factors inspiring them to lace up their marching shoes.
Demonstrators in Washington, D.C. Photo by Jessica Kourkounis/Getty Images.
12. Because, yes, sometimes even the president needs to be reminded that the truth isn't up for debate.
Demonstrators in Washington, D.C. Photo by Jessica Kourkounis/Getty Images.
13. Nothing short of our survival is at stake, after all.
Demonstrators in Boston. Ryan McBride/AFP/Getty Images.
14. The march brought out an eclectic group of truth-tellers too, like those with an interest in what's happening beyond our planet.
Demonstrators in Washington, D.C. Photo by Brendan Smialowski/AFP/Getty Images.
15. And those who care about what's happening down below.
Demonstrators in New York City. Photo by Bryan R. Smith/AFP/Getty Images.
16. People of all ages were seen fighting for science — some of them old, some of them young, and all of them fired up.
Demonstrators in Berlin. Photo by Sean Gallup/Getty Images.
17. There were a few big-name scientists in the crowd as well.
Trailblazers Sally Ride, Mae Jamison, Ada Lovelace, Shirley Malcom, Jane Wright, and Rosalind Franklin also made (cardboard) appearances.
Demonstrators in Washington, D.C. Photo by Jessica Kourkounis/Getty Images.
18. And Bill Nye, never without his bow tie, helped rally supporters in the nation's capital.
Photo by Jessica Kourkounis/Getty Images.
19. Even four-legged friends trekked out in the cold — because ignoring science affects every living thing.
Demonstrators in Boston, Massachusetts. Ryan McBride/AFP/Getty Images.
20. The massive success of the March for Science makes it clear that now really isn't the best time to remain silent.
Demonstrators in London. Photo by Daniel Leal-Olivas/AFP/Getty Images.
21. Because, no matter your political persuasion, there is no Planet B to call home.
Demonstrators in Paris. Photo by Francois Guillot/AFP/Getty Images