What is Life?

My sister always talks about how life is a funny idea. She says that the idea of being locked in a school all day is like they are forcing you to make friends. She says that when she is most stressed out about a lab in AP Chem class, she thinks about how one day in life, the lab won't matter, and all of that stress will be lost. Still, she always tries her best. She always says to laugh about things in life because you should make your life what you want it to be. I never really understood what she was talking about, but the more I think about it, the more I get it. It turns out that my sister is actually not stupid, but very wise. She takes in everything for what it's worth, and I know that everybody could learn something from her.