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The DCMP provides services designed to support and improve the academic achievement of students with disabilities. We partner with top educational and television content creators and distributors to make media accessible and available to these students.
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It's Okay to Be Smart: Why Do We Cry?

4 minutes 20 seconds

Now Playing As: Captioned (English) (change)

Why do humans cry? It’s weird. Humans leak water out of their faces when they get sad. Are they the only animals that do this? What does it mean? What is it for? Here’s the science of human tears. Part of the "It's Okay to Be Smart" series.

Media Details

Runtime: 4 minutes 20 seconds

Topic: Science, Social Science
Subtopic: Biology, Emotions, Physiology
Grade/Interest Level: 7 - 12
Standards:

Release Year: 2018
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.