timeline
Big History · url (Feb 2022)
Earthviewer Online · url (Jan 2017)
How a single-celled organism almost wiped out life on Earth · url (Jan 2018)
Milestone Cases in Supreme Court History · docx (Nov 2017)
The 25 Biggest Turning Points in the Earth’s History · url (Sep 2016)
Timeline of Animal Domestication · pdf (Jul 2017)