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Why do we cry?

Can anyone explain scientifically or something why do we cry, and how exactly does it help us?

http://www.smartplanet.com/business/blog/smart-takes/why-do-i-cry-research-reveals-evolutionary-advantage-to-tears/10119/

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From the officers:

The ACA Lecture Series continues Sunday, March 8th at 12:15pm at the Austin History Center, 9th and Guadalupe. The building opens at noon. Ryan Bell will talk on "My Year Without God: Now a Permanent Condition."