Crash Course
Crash Course Kids 38.1: Big Changes in the Big Apple
Find out how humans have been changing our environments for a long time. [4:56]
Crash Course
Crash Course Ecology #6: Ecological Succession: Change Is Good
In the world of ecology, the only constant is change - but change can be good. Today Hank explains ecological succession and how ecological communities change over time to become beautiful, biodiverse mosaics. [10:02]