“This will very likely be the largest assembly of scientists and science advocates in history. We aim to utilize the momentum of this march to strengthen evidence-based policy decisions,” said Alex Bradley, a molecular biologist and lead organizer of the March for Science Los Angeles. “This march will draw out typically introverted, politically averse academics and stakeholders of all kinds to literally shout their support for science and the necessity of its findings in informing policy decisions.”

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This march follows the momentum of numerous marches that have taken place since Trump’s inauguration, including the Women’s March, which drew a crowd of 750,000 in L.A.

The science march will start at 9 a.m. In addition, there will be several science outreach programs and events designed to educate the public on environmental issues facing Southern California.