I just got my macbook pro. It is my first laptop, and I love it. I remember years ago hearing that when you first get a new laptop, you should drain the battery, and then recharge it and some whole process. Is this true, or just myth? Additionally, when i am at school, is it bad to leave the computer plugged in all the time? Will it shorted battery life? I will basically be using this as a desktop, except when i come home.