How big is a billion?

A billion is a hard number so let's get some perspective. A billion seconds ago it was 1959. A billion minutes ago Jesus was alive. A billion hours ago was the Stone Age. A billion days ago no-one walked on the earth on two feet. A billion Pounds ago was only 13 hours and 12 minutes... - at the rate our government is spending it. Thanks Gordon!

H/T Stuart Barrow (ASI alumnus)