Bill Nye, the science guy, was among the speakers at the rally before the DC March for Science. He was a huge hit with the crowds, which numbered in the many thousands! Click here to start the slide show.
Dr Mona Hanna-Attisha with Little Miss Flint. Dr Attisha alerted the public and media to the Flint Water Crisis.
Maya Lin, who designed the Vietnam Memorial on the US National Mall, is also an environmentalist.
Signs at the DC March for Science were pointed and humorous — carried by kids, families, scientists.
An entire family, all with signs, at the DC March for Science, just outside the National Mall.
A variety of T-rexes at the DC March for Science posed for selfies and stills.
What’s a rally without great music? The DC March for Science kept people moving and grooving despite the continuous rain