Scientific Explanation of why people cry when they are sad?

When I see a hurt animal I always want to cry and I feel reeeeealy sad but when i see a hurt person i would not care that much if it someone i don't know. Is there some explanation to it? I know that the most people react the same way!

I've been so pissed off at all the "proud Aspies" telling me autism's great and I should learn to be accepting... but now I feel like a jerk because I've started generalizing all people with Asperger's to be rude, ignorant morons. I have 3...

i am always tired, i do alot of exercise as i am a dancer and used to be a gymnast but no matter how much sleep I get I am always tired, i have also suffered from headaches for over 2 years now and the doctors still don't no why, i also find it extremely...

There is this assistant in my class who's with a guy that has problems...i've fainted many times at the gym and he took me to the hospital,and i also have a toilet problem and i pee my stomach hurts and i stop breath,he was always there for me alwaysm...

Just seen the video of Anders Breivik crying in court while he watched a video recording of his crime and it got me asking the question, can evil people cry honestly and remorsefully? There's a big debate as to Mr Breivik's sanity and I'm convinced he...

Now, I obviously don't think a little tiny baby that is under 2-3 months old should be left to 'cry it out' because they usually need something when they cry. However, as they get older they begin to cry for entertainment reasons, or because they are...

The question is "why do you think people gossip? Why do you think people allow others to gossip with them?" Mine response got kind of lengthy and I cant tell if makes sense anymore. I think people gossip because everyone is sort of fascinated...