Www.Wikipedia.org. Look it up.
OT: I believe
emotion all in all, is made up of 3 basics (like the basic colors).
These are: Love, hate, and indifference.
Love is a feeling of addiction towards another being. But not a miserable addiction such as with drugs, no. Its the happiest feeling known to man.
If the person you love sends you a text saying "Im not feeling well... my stomach hurts

", you will most definitely, instantly feel an urge to do anything you can, to rid your loved one of that pain. Even when it is something as minimal as an aching stomach.
You will feel deeply happy and satisfied, whenever you're with the person you love. As if nothing could ever get any better than that.
You will feel attached to this person, and you would feel lost if this person was ever to leave your life permanently.
Basically: Your 'loved one' is the drug that makes you the happiest man on earth, and you will do whatever you can (even die) to keep your 'loved one' happy, healthy, and within reach.
- I'm sorry i didn't get on to hate and indifference (I made it sound like I would examine them all), but I think the post would get a little too long.
[sub] And off-topic... [/sub]