why does everyone cry?

Crying. Its a way to express our emotion of sadness, and happiness or when someone or something "touch" our heart that we cannot hold on the tears. It is because of our psycological arousement is connected to our brain and the body react to what the brain is thinking, and tears will be running down and thats the way God actually created us. If you want to ask for more details in this topic, I am afraid that I cannot explain you no more, I hope this is good enought to answer the qeustion you asked?

Well i think its just a way of expressing our emotions.... No scientific explanations.... I aint a scientist so for me its just a way to ruin your health... LOL Keep Smiling well thats wat i do... Cheers!!!!