i dont know man.. you can drive youself insane pondering on all those factors... but as humans, most of us do anyway. perhaps its the feeling of mystisicm and uncertainty that drives us to want to know things. all i know is that im here, right now, and that's all im worrying about. live life the fullest while you can cause it does end.. well mabye not I heard something in 1998 about scientists succesfully engineering 'immortal' human cells. so yeah one day we will definitely be able to live forever, perhaps even uncover the mystery of our world..