Khan Academy is co-sponsoring the Breakthrough Junior Challenge, in which students in ages 13-18 create videos (3 minutes or less) to explain a challenging concept in physics, mathematics, or the life sciences in an engaging, illuminating, and creative way. This year, the videos may also be about the science or math behind the causes, impacts, and potential solutions of the COVID-19 health crisis. Substantial awards are available to the winning student and that student’s teacher and school. Last year’s finalist videos are here. The dealine for entries is June 25.