WE live under the shadow of a gigantic question mark.
Who are we?
Where do we come from?
Whither are we bound?
Slowly, but with persistent courage, we have been pushing this question mark further and further towards that distant line, beyond the horizon, where we hope to find our answer.
We have not gone very far.
We still know very little but we have reached the point where (with a fair degree of accuracy) we can guess at many things.