Kosher: Meat and Milk

I would like to better understand the reason for the Jewish practice of waiting six hours after eating meat before eating milk products. Where is this in the Torah? Is eating them close together considered like cooking them together, which is very hard for me to digest (pardon the pun)?

Kosher: Meat and Milk

I have always had trouble understanding the prohibition of consuming meat together with milk. I can understand if there are certain animals that their consumption has a negative effect on a person. But if an animal is kosher by itself, and the milk is kosher, why should they be forbidden if they’re together?