Cochrane Crowd is running a Challenge from 22.10 - 24.10.2019, even though the Cochrane Colloquium in Santiago de Chile has been canceled. The goal is to reach 20,000 classifications in 48 hours. Everyone is invited to participate. No matter in which country or how long you want to participate - every screened study counts! And there will also be a prize. So it's really rewarding to take part! It starts on Tuesday 22. October 2019 at 6:00 pm in Switzerland (13:00 Chile time). To register to Cochrane Crowd and for further information please visit the website.