May 13, 2015
Special | 28m 42s | Video has closed captioning.
Volunteers are planting 10,000 trees on the Meramec River. A free St. Louis University Medical School Asthma clinic treats those who need it most. Hari Sreenivasan talks with autism researcher Wendy Chung. A former NASA employee is working on a Hubble Telescope replacement. On a November day in 1939, the smoke pollution in St. Louis was so bad it became known as Black Tuesday.
Problems Playing Video? | Closed Captioning