From the rain-soaked National Mall in Washington D.C., to cities across the United States and around the world, on the streets of Cape Town, Kampala, Lagos, Accra, Madrid, London, Geneva, Seoul, Mexico City, Munich, Rio and Rome, and cities across Canada, Australia, New Zealand and Japan, marchers in about 600 events globally stood up for science Saturday, in an Earth Day call for evidence-based investment and action.