Dont understand Daylight Savings!

[bucutie02]

Last night as i was laying in bed, a question occurred to me. Why is it that not all 50 states have Daylight Savings? Before my friend went to ASU- her boyfriend was already in Arizona going to another school- and he had told her that they never did that. So i asked her and all she said was that they dont. Anyway i kept bugging her about it and she kind of got fed up with me so i stopped. hehe Although, i never got an answer as to why. Arizona isnt the only state that doesnt do this right? I think there are others. If anyone knows why and which other states- i would appreciate it.