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Be Smart

Why Are There 7 Days In a Week? Explained

Season 8 Episode 22 | 15m 14s

Why does everyone use a 7 day week, and where did it come from? Where do the names of the days come from? And who can we blame for Mondays? Here’s the true story of one of the oldest human customs still in use today. It gets a little weird.

Aired: 11/08/20
Extras
Watch • 8:32
Nature
NATURE - Season 45
Get a sneak peek at a brand new season of NATURE on PBS.
Preview: S45 | 8:32
Watch • 2:37
American Masters
Mary Oliver: Saved by the Beauty of the World
Celebrate the life and career of Pulitzer Prize-winning poet Mary Oliver.
Preview: S40 E5 | 2:37
Daniel Tiger's Neighborhood
Stargazing Gameplay
Watch as Daniel and O the Owl embark on an out-of-this-world journey filled with learning, and fun.
Clip: 3:38
Daniel Tiger's Neighborhood
My Fish Tank Gameplay
Relax and unwind with Daniel as he watches the fish!
Clip: 9:01
Daniel Tiger's Neighborhood
At the Dentist Gameplay
Get ready for the best dentist visit ever with Daniel and Dino.
Clip: 7:02
Daniel Tiger's Neighborhood
My Bedtime Gameplay
Everyone in the neighborhood has a special bedtime routine!
Clip: 8:53
Daniel Tiger's Neighborhood
Look Closely Gameplay
Explore and look closely at many things in the Enchanted Garden along with Daniel Tiger.
Clip: 13:47
Daniel Tiger's Neighborhood
Classroom Helpers Gameplay
You can be a helper along with Daniel's classmates by caring for and cleaning up the classroom.
Clip: 4:00
Daniel Tiger's Neighborhood
Bathrooms Gameplay
Learn along with Daniel Tiger about all the sights and sounds of different bathrooms.
Clip: 5:54
Daniel Tiger's Neighborhood
Build a Boat Gameplay
Put your creative skills to the test and build a boat with Daniel Tiger and Ana Platypus!
Clip: 7:05
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