How a trillion stacks up.

• Position: NUMBERS

Last month, President Bush proposed a $2.77 trillion budget. Obviously, that's a lot of money. Even one trillion of anything can be difficult to fathom.

ACRES OF LAND ON EARTH 37 BILLION ALL PEOPLE WHO EVER LIVED about 100 BILLION PENNIES IN USE 150 BILLION STARS IN THE MILKY WAY up to 400 BILLION ONE TRILLION Note...