Our Origin.....Something to Ponder

Dear Friends,
I was reading some articles on the origin of human beings on this planet.
The major assumption or i should say almost confirmation is that
" The human beings originated in the African continent"
Can any one think why on the African continent only and not any other land mass on the earth?
What was the trigger for that?
Is there any rationale to it or it was a mere chance?

Biggest irony of life !!!

Pain is the begning of all life..........
it was our first experince in the world still we have not learned to
manage it.......or handle it........or cope with it........ or transcend it.....
we say that life teaches everything but we fail to learn and comprehend the first lesson that life has made us experience it...that is the irony of life