The United States is $28 trillion in debt, and it was going to run out of money on October 18th if it couldn't borrow more. Fortunately, an agreement was reached in Congress to temporarily raise the debt ceiling and keep the government functioning. Unfortunately, the debt problem was kicked like a can into the near future, and a political solution will need to be agreed upon in December. Cal reached out to billionaire philanthropist and best-selling author David Rubenstein for an explanation on how our $28 trillion debt got started and how it affects all of us -- as well as the rest of the world. Mandatory listening.