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It's Okay to Be Smart: Why the Heck Is Glass Transparent?

5 minutes 42 seconds

Now Playing As: Captioned (English) (change)

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Glass is made of sand, which is a kind of rock. But glass is transparent, and rocks aren’t. So, why is glass clear? Part of the "It's Okay to Be Smart" series.

Media Details

Runtime: 5 minutes 42 seconds

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.
It's Okay to Be Smart
Season 7 / Ep 11
11 minutes 12 seconds
Grade Level: 10 - 12
Different math equations and graphs are drawn, with a butterfly as the backdrop.
It's Okay to Be Smart
Season 7 / Ep 7
9 minutes 17 seconds
Grade Level: 10 - 12
An animal with the body of a lion, an extra goat head on its back, and a snake instead of a tail. Caption: Chimera.
It's Okay to Be Smart
Season 7 / Ep 14
9 minutes 43 seconds
Grade Level: 10 - 12
A star filled night sky. Caption: P B S.
It's Okay to Be Smart
Season 7 / Ep 16
10 minutes 26 seconds
Grade Level: 10 - 12
Sunlight is shining through in a forest with large number of trees.
It's Okay to Be Smart
Season 7 / Ep 17
5 minutes 27 seconds
Grade Level: 10 - 12
Eggs of Screech owl, Turkey vulture, Audubon's Caracara, Kingfisher, Common Murree, Yellow Billed. Caption: Stoddard Et Al. Science 20 17.
It's Okay to Be Smart
Season 7 / Ep 19
7 minutes 23 seconds
Grade Level: 10 - 12
A view of Moon in the dark sky. Caption: Maria, Latin for seas, and Sea of Tranquility, Mare Tranquillitatis.
It's Okay to Be Smart
Season 7 / Ep 15
10 minutes 31 seconds
Grade Level: 10 - 12
Two different types of bacteria are seen all over a human outline. Caption: 37.2 trillion and 39 trillion.
It's Okay to Be Smart
Season 7 / Ep 20
11 minutes 24 seconds
Grade Level: 10 - 12
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.
It's Okay to Be Smart
Season 7 / Ep 21
9 minutes 36 seconds
Grade Level: 10 - 12
The sample particles enter the mass spectrometer, which is accelerated, and then separated according to their individual mass of the particles by a magnet.
It's Okay to Be Smart
Season 7 / Ep 22
11 minutes 20 seconds
Grade Level: 10 - 12