U.S. Debt Clock

Right now I'm reading a book called "Whatever Happened to Penny Candy?," a good book about economics. This book is an awesome read for anyway that wants to learn about economics in a understandable way. :) 

Anyway, in this book it said you can follow our U.S. National Debt on a debt clock. I was instantly fascinated, and I went searching today to find one. We currently owe over $16 trillion dollars, and as you watch the debt clock the numbers keep getting bigger and bigger. It's scary, but fascinating. It makes me wonder how long we can go before something happens. Can debt go forever?  

This debt clock that I found is the one I like best. It shows National Debt, State Debt, and other big numbers that I don't understand. :)   

It also has other interesting numbers such a US Population, Official Unemployed, US workforce, US Families, Food Stamp Recipients, Bankruptcies, and others.   

U.S. National Debt Clock : Real Time

Here is two more debt clocks with less information: 

This one has some interesting things to say about why we have debt and how to stop the borrowing/spending cycle: 

 USA Debt Clock.com

And one more:

Real Time US National Debt Clock