Meaning of Life

Human beings are amazing creatures. I don't imagin chickens in a chicken farm ever question their meanings of life. :) But I would say every human will wonder this quesion at sometime, even losing sleeps on it. There are a list of answeres here, feel free to choose one.

However, no matter what answer we end up with, the question come back from time to time, what is the meaning of life? What is life's purpose?

I finally decided that I have spent too much time on this question and come to this conclusion (of course, my personal conclusion only): the meaning of life for human is not much different than the meaning of any life on earth; the meaning of life is joy.