Despite claims that the March for Science was nonpartisan, there was a lot of anger directed at President Trump.
Protestors at the March for Science spoke about climate change, the EPA and inspiring others.
Rear Adm. Sylvia Trent-Adams stepped up from her role as deputy surgeon general.
A study found that if all states had a medical marijuana law, it would save taxpayer money used on prescription drugs.
The United Kingdom went a full day without using coal power, a big step in its attempt to phase it out entirely.
Organizers have been planning the event since January.