Researched and Written by Leila Battison
Narrated and Edited by David Kelly
Art by Khail Kupsky
Thumbnail Art and Art by Ettore Mazza

If you like our videos, check out Leila's youtube channel:

   / @somethingincredible  

Music from Epidemic Sound and Artlist.

References:

http://www.bbc.co.uk/earth/story/2015...
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://science.sciencemag.org/conten...
https://scihub.do/10.1126/science.16...
   • That Time Oxygen Almost Killed Everyt...  
https://www.michigan.gov/documents/de...
https://courses.lumenlearning.com/bou...
https://scihub.do/10.2475/ajs.s423....
https://www.scientificamerican.com/ar...
https://books.google.co.uk/books?id=H...
https://www.researchgate.net/publicat...  
https://bio.libretexts.org/Bookshelve...
https://www.researchgate.net/publicat...
https://agupubs.onlinelibrary.wiley.c...

Image Credits (in order of appearance):

Doc. RNDr. Josef Reischig, CSc., CC BYSA 3.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

By James St. John Jaspilite banded iron formation (Soudan IronFormation, Neoarchean, ~2.69 Ga; Stuntz Bay Road outcrop, Soudan Underground State Park, Soudan, Minnesota, USA) 53, CC BY 2.0, https://commons.wikimedia.org/w/index...

By James St. John Jaspilite banded iron formation (Soudan IronFormation, Neoarchean, ~2.69 Ga; Stuntz Bay Road outcrop, Soudan Underground State Park, Soudan, Minnesota, USA) 53, CC BY 2.0, https://commons.wikimedia.org/w/index...

James St. John, CC BY 2.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

James St. John, CC BY 2.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

By Yanenming Own work, CC BY 3.0, https://commons.wikimedia.org/w/index...

By Bäras Own work, CC BYSA 3.0, https://commons.wikimedia.org/w/index...

By McGhiever Own work, CC BYSA 3.0, https://commons.wikimedia.org/w/index...

By Zosma Own work, CC BYSA 3.0, https://commons.wikimedia.org/w/index...

By John Sweeney Own work, CC BYSA 3.0, https://commons.wikimedia.org/w/index...

By Abrget47j Own work, CC BYSA 3.0, https://commons.wikimedia.org/w/index...

By Mhsheikholeslami Own work, CC BYSA 4.0, https://commons.wikimedia.org/w/index...

By James St. John Tillite (Coleman Member, Gowganda Formation, Paleoproterozoic, ~2.3 Ga; Straight Lake West roadcut, north of Temagami, Ontario, Canada) 10, CC BY 2.0, https://commons.wikimedia.org/w/index...

James St. John, CC BY 2.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

James St. John, CC BY 2.0 https://creativecommons.org/licenses/..., via Wikimedia Commons

By Oleg Kuznetsov Own work, CC BYSA 4.0, https://commons.wikimedia.org/w/index...

Life restoration of Mimoperadectes. By Jorge González Horovitz I, Martin T, Bloch J, Ladevèze S, Kurz C, et al. (2009) Cranial Anatomy of the Earliest Marsupials and the Origin of Opossums. PLoS ONE 4(12): e8278. doi:10.1371/journal.pone.0008278.g006, CC BY 2.5, https://commons.wikimedia.org/w/index...