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PBS Member Stations rely on viewers like you. To support your local station, go to: http://to.pbs.org/DonateOKAY ↓ More info and sources below ↓ We’re on PATREON! Join the community https://www.patreon.com/itsokaytobesmart SUBSCRIBE so you don’t miss a video! http://bit.ly/iotbs_sub Why does everyone use a 7 day week, and where did it ...
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