Why Do We Cry?

Have you ever wondered why water comes out of your eyes when you get sad?
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Sources:
http://www.independent.co.uk/life-style/health-and-families/features/why-do-we-cry-the-science-of-tears-9741287.html
http://science.howstuffworks.com/life/inside-the-mind/emotions/crying1.htm
http://www.nature.com/scitable/blog/mind-read/why_do_we_cry_when
http://www.youreyedoc.com/st-louis/dry-eye-center.htm

Видео Why Do We Cry? канала Life Noggin