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. References: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/P/Protists.html http://www.cod.edu/people/faculty/fancher/prokeuk.htm http://www.genomenewsnetwork.org/articles/03_00/gandg_quickswitch_3_24.shtml http://biology.clc.uc.edu/courses/bio106/protista.htm :http://www.ucmp.berkeley.edu/protista/basalprotists.html http://www.ucmp.berkeley.edu/protista/testaceafilosea.html http://www.ucmp.berkeley.edu/protista/slimemolds.html http://www.ucmp.berkeley.edu/protista/alveolates.html http://www.ucmp.berkeley.edu/protista/rhodophyta.html Table of Contents 1) Archaea 03:23 a) Methanogens 04:02 b) Extremophiles 04:24 2) Bacteria 05:24:2 3) Gram Positive 06:50 a) Proteobacteria 07:15 b) Cyanobacteria 07:30 c) Spirochetes 07:42 d) Chlamydias 07:52 4) Protists 08:12 a) Protozoa 09:03 b) Algae 09:54 c) Slime Molds 11:13 Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Instagram - https://www.instagram.com/thecrashcourse/ CC Kids: null