U.S. Debt Set to Soar in This Year - washingtonpost.com

For now, investors are frantically stuffing money into the relative safety of the U.S. Treasury, which has come to serve as the world's mattress in troubled times. Interest rates on Treasury bills have plummeted to historic lows, with some short-term investors literally giving the government money for free.

But about 40 percent of the debt held by private investors will mature in a year or less, according to Treasury officials. When those loans come due, the Treasury will have to borrow more money to repay them, even as it launches perhaps the most aggressive expansion of U.S. debt in modern history

U.S. Debt Set to Soar in This Year - washingtonpost.com