http://www.shorttext.com/6ttkbu

From the page: “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 its 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 on two feet.”