Big History: metanexus
https://www.khanacademy.org/partner-content/big-history-project
school.bighistoryproject.com/bhplive
https://en.wikipedia.org/wiki/Big_History
https://en.wikipedia.org/wiki/Chronology_of_the_universe
https://en.wikipedia.org/wiki/Big_History
https://en.wikipedia.org/wiki/Chronology_of_the_universe