<p>Thousands rallied on the National Mall</a> in Washington, DC, on April 22 for the March for Science. This video shows the march in front of the National Gallery of Art.</p><p>The event</a> started at 9 am, and the demonstrators started marching at 2 pm, despite heavy rain.</p><p>Crowds gathered in towns and cities worldwide</a> to protest against negative political interference in scientific research and development. The marches coincided with Earth Day.</p><br />
