How big is a trillion anyway?

"A billion here, a billion there, pretty soon it adds up to real money."  Senator Everett Dirksen is said to have coined the phrase that has become famous for describing Congress' spending habits.  You can only wonder what he'd say today to describe the Democrats' trillion dollar stimulus.

But what exactly is a trillion?  What does a trillion of anything look like?  It's hard to get your mind around, but here are some examples:

• One million seconds equals 1 week, 4 days, and some change.
  
• One billion seconds equals 31 years, 251 days, and some change.
  
• One trillion seconds equals 31,688 years, 269 days, and some change.
  

or...

$1 trillion would be enough money to buy 1,000 boxes of Girl Scout cookies for every person in the United States.