Crash Course

Old & Odd: Archaea, Bacteria & Protists (2x35)

Air date: Sep 24, 2012

Hank veers away from human anatomy to teach us about the (mostly) single-celled organisms that make up two of the three taxonomic domains of life, and one of the four kingdoms: Archaea, Bacteria, and Protists. They are by far the most abundant organisms on Earth, and are our oldest, oddest relatives.