More than one million people around the world gathered on April 22, 2017 to defend the role of science in policy. Since then, science has continued to face increasing threats at the federal, state, and local levels. But science will not stay silent and on April 14, 2018 science supporters around the world will once again unite for science for the common good. We will continue to use the momentum of last year’s march to hold our political leaders accountable for passing equitable, evidence-based policies that serve all people and all communities.