$16,000,000,000,000

$16,000,000,000,000

According to the Treasury Department, the U.S. National Debt has topped $16 trillion. Here's a visual courtesy of USDebtClock.org.

So what exactly does this mean?

Just under $5 trillion of the national debt is owed to the Social Security Trust Fund and federal pension systems. A little more than $11 trillion is owed to foreign and domestic...