Not all headaches represent migraines, and migraine is not the only condition that can cause severe and debilitating headaches. For example, cluster headaches are very severe headaches that affect one side of the head in a recurrent manner (occurring in a cluster over time).
The United States government is the largest issuer of debt securities, and its bonds are considered the safest fixed-income investments available to your customer.
To Whom Does the U.S. Owe Money? At the end of its 2013 fiscal year on September 30, 2013, the total public debt outstanding for the United States federal government was $16.738 trillion.