Every It's Okay to Be Smart episode. Ever.

More moon rocks on Smarter Every Day ►► https://youtu.be/QxZ_iPldGtI And Objectivity ►► https://youtu.be/yvhLBzsDwSQ ↓↓↓ More info and sources below ↓↓↓ SUBSCRIBE so you don't miss a video! ►► http://bit.ly/iotbs_sub Fifty years ago, we sent the first astronauts to walk on the moon's face. But what they brought back is just as important as what got them there.

Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate This is part 3 of our special series on Human Ancestry! Watch the entire series here ►► http://bit.ly/OKTBSHuman ↓↓↓More info and sources below ↓↓↓ In part 3 of our special series on human ancestry, we investigate how closely related we all really are.

Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate Try 23andMe at: http://www.23andme.com/okay Part 2 of our special series on Human Ancestry. Watch it all: http://bit.ly/OKTBSHuman ↓↓↓More info and sources below ↓↓↓ In part 2 of our special series on human ancestry, we ask why we are the only surviving branch on the human evolutionary tree.

Duh, except for the sky... and the ocean... Don't miss our next video! SUBSCRIBE! ►► http://bit.ly/iotbs_sub ↓↓↓ More info and sources below ↓↓↓ Among living things, the color blue is oddly rare. Blue rocks, blue sky, blue water, sure. But blue animals? They are few and far between.

Viewers like you help make PBS (Thank you 😃) . Support your local PBS Member Station here: https://to.pbs.org/PBSDSDonate Try Squarespace: http://squarespace.com/itsokaytobesmart Don't miss our next video! SUBSCRIBE! ►► http://bit.ly/iotbs_sub ↓ More info and sources below ↓ For more science and stories of the Anthropocene, subscribe to the Generation Anthropocene podcast: http://anthropocene.stanford.edu/ A great book on this subject: The Earth After Us: What Legacy Will Humans Leave in the Rocks?

Check out America From Scratch: https://youtu.be/LVuEJ15J19s SUBSCRIBE so you don't miss a video! ►► http://bit.ly/iotbs_sub ↓↓↓ More info and sources below ↓↓↓ It never gets dark anymore. Not REALLY dark, anyway. Not like it used to. Light pollution is not only making it more difficult to see the night sky, but it's also affecting our health.