Mother Nature was appropriately unexpected on Earth Day, as April 22's skies above Portland first gave way to rain, sunshine, rain again, and then finally partly cloudy skies as the sun peeked through.

And beneath those erratic skies, armed with umbrellas and signs, were thousands of demonstrators at Tom McCall Waterfront Park, there to march in the name of science. The March for Science occurred in hundreds of cities across the nation and world on Earth Day.