How many zeros in a billion? 

A billion is a difficult number to comprehend, but one advertising agency did a good job of putting that figure into some perspective in one of it's releases.


A. A billion seconds ago it was 1959.


B. A billion minutes ago Jesus was alive.


C. A billion hours ago our ancestors were living in the Stone Age.


D. A billion days ago no-one walked on the earth.


E. A billion dollars ago was only 8 hours and 20 minutes.