I beg to differ with Dr Greene and perhaps many, many others regarding the so called purpose of life. There's no purpose to it all. The only, to me, discernible effect of life is to conclude it in an inexorable death. So long we remain prisoners of time, that's all it is, a wasteful, pathetic journey into oblivion and irrelevance, to put it poetically. It most certainly contains happy events here and there but make no mistake, death awaits us.