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It's Okay to Be Smart: Why Are There 7 Days in a Week?

15 minutes 32 seconds

Now Playing As: Captioned (English) (change)

Why does everyone use a 7 day week, and where did it come from? Where do the names of the days come from? Here’s the true story of one of the oldest human customs still in use today. Parts of the "It's Okay to Be Smart" series.

Media Details

Runtime: 15 minutes 32 seconds

Topic: Education, Science
Subtopic: Astronomy, General Education, Space Sciences
Grade/Interest Level: 10 - 12
Standards:

Release Year: 2020
Producer/Distributor: PBS Digital Studios
Series: It's Okay to Be Smart
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Seven different butterflies, where four are placed at the corners facing the butterfly at the center and two at either side of the central butterfly.

Different math equations and graphs are drawn, with a butterfly as the backdrop.

An animal with the body of a lion, an extra goat head on its back, and a snake instead of a tail. Caption: Chimera.

A star filled night sky. Caption: P B S.

Sunlight is shining through in a forest with large number of trees.

Eggs of Screech owl, Turkey vulture, Audubon's Caracara, Kingfisher, Common Murree, Yellow Billed. Caption: Stoddard Et Al. Science 20 17.

A view of Moon in the dark sky. Caption: Maria, Latin for seas, and Sea of Tranquility, Mare Tranquillitatis.

Two different types of bacteria are seen all over a human outline. Caption: 37.2 trillion and 39 trillion.

Collage with black and white illustration of a twelfth century Chinese man holding out a scrap of paper. A red lantern on a pole overhead. Red prohibited symbol covers image of 2 gold bars.

The sample particles enter the mass spectrometer, which is accelerated, and then separated according to their individual mass of the particles by a magnet.