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One theory is that we cry to nonverbally express distress and elicit help from others.

en.wikipedia.org/wiki/Crying

Crying is the shedding of tears in response to an emotional state. This includes anger ... This theory could explain why people cry during cheerful events, as well as very painful events. ..... "Ch. 14: Do Animals Shed Emotional Tears?". Crying: ...

www.independent.co.uk/life-style/health-and-families/features/why-do-we-cry-the-science-of-tears-9741287.html

Sep 18, 2014 ... Crying can be scientifically defined as the shedding of your tears in .... You know the ones - those insincere, fake tears that people can ...

www.webmd.com/balance/features/why-we-cry-the-truth-about-tearing-up

Oct 30, 2009 ... What's behind our crying? Why do some people cry so much more or less readily than others? And what's the best way to handle all those tears ...

www.livescience.com/32476-why-do-we-cry.html

May 10, 2016 ... Why do we cry, and what good does it do us? There are different ... Tears well up in people's eyes for a slew of reasons. A teardrop running ...

time.com/4254089/science-crying

Mar 16, 2016 ... In fact, there's also a lot scientists don't know—or can't agree on—about people who do cry. Charles Darwin once declared emotional tears ...

www.quora.com/Why-do-humans-cry-and-shed-tears-when-they-get-emotional-What-is-the-physiological-explanation-for-tears

In this case, people who cry would be better at getting their needs met, and this ... If there's a famine, do you give the last piece of meat to the person who says ...

www.theguardian.com/science/2013/apr/14/why-do-humans-cry-biology

Apr 13, 2013 ... The trouble is that quite often – as when people cry when driving alone, a common phenomenon according to Vingerhoets – our tears catch us ...

www.huffingtonpost.com/2013/02/04/why-do-we-cry-when-were-sad_n_2583885.html

Feb 4, 2013 ... But why do strong emotions like sadness or frustration make water ... People feel less angry, less sad, so crying does appear to alleviate stress.

www.apa.org/monitor/2014/02/cry.aspx

Researchers are tracking people's crying episodes to determine the role culture ... And how do crying behaviors differ among cultures and between the sexes?