Does anyone think that mankind will EVER know all the secrets behind such things? I don't, because each answer we reach, creates many more questions. Heck, one could even say; against all the scientific evidence to the contrary, that the Earth has existed forever, that there was no beginning, there'll be no end, kind of like a circle. I don't have proof of that, but until we can go back in time (or forward to the future), we can never be 100% certain of what really happened, or what is supposed to happen.

I feel that such questions are beyond mankind's grasp, and, even if we do discover the "secret", what difference will that even make to us? We'll still eat, sleep, breath, and talk as we always did. Still won't stop us curious humans striving for this level of understanding though!