Saturday is Earth Day, and thousands are expected to take to the streets in Washington, DC, and other cities across the US and around the world. But instead of celebrating the natural environment – the People's Climate March will happen a week later – Cornell University biologist Sarah Evanega says Saturday's events are an opportunity for people of all political stripes to stand up in support of science.

"And without it, we would have no cure for polio, no microchips, no cell phones, no artificial hearts, no treatment for diabetes. This is not a partisan issue. We all benefit from the products of science."

One of America's most famous scientists – Bill Nye – is co-chairing the event alongside Dr. Hanna-Attisha, who discovered dangerous lead levels in kids living in Flint. Michiganders can join events in more than a dozen cities including Detroit, Grand Rapids, and Lansing. More than 500 are planned across the globe.