It's been a year since Joe Hanson took his fantastic science tumblr, It's Okay to be Smart, to YouTube. To celebrate, his latest episode takes a look at the ways humans experience years biologically, and how we define them astronomically.

All in all, it's a clever take on the various ways that science ‚Äď and our understanding of it ‚Äď can shape our perception and experience of time. Good stuff on everything from the spin of the Earth, to leap seconds, to analemmas, solstices and equinoxes.

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[IOTBS]