why do we cry? – Caesium Zone

Question: why do we cry?
- Keywords:
  cry,
  eye,
  human
Asked by raivisk to Joe, Juan, Kate, Rory, Rosie on 7 Mar 2014. This question was also asked by dan33.
- Joe Sweeney answered on 7 Mar 2014:
  
  The correct answer is: ‘nobody knows’! Basically, we cry in response to a problem, which can be caused by different things. Babies cry when they are sad, in pain, or angry, while adults seem to cry mainly for sadness and (less so) for pain. Of course, adults also cry when they are happy! It seems that crying is mainly an emotional response which releases stress. Beyond that I have no idea!

Question: why do we cry?