Meet Ayana Johnson, a marine biologist who studies coral reefs. She shows us what she does, why it is important work, the benefits of this type of occupation, and what she does for relaxation. [7:57]

Hank wraps up the Crash Course on ecology by taking a look at the growing fields of conservation biology and restoration ecology, which use all the kung fu moves we've learned about in the past eleven weeks and apply them to protecting...