<p>Thousands of people rallied to join the March for Science in Vienna on Saturday, April 22.</p><p>Police estimated that 1,600 had joined the march, while organizers put the number at 3,000, according to local reports</a>.</p><p>This video shows demonstrators gathering and then marching on the city center.</p><p>Crowds gathered in towns and cities worldwide to protest</a> against negative political interference in scientific research and development. The marches coincided with Earth Day.</p><br />
