For years biologists have figured the aging process is so complex it must involve thousands of genes, too many to offer an effective targeted therapy.

FORBES: On The Cover/Top Stories

The U.S. continues to spend several billion dollars each year to maintain the nuclear weapon complex and the aging stockpile.

CENTERFORSECURITYPOLICY: Center For Security Policy

Part of the problem, according to the IG, is that the facilities of the nuclear weapons complex have been aging and need increased spending for maintenance and replacement.

CENTERFORSECURITYPOLICY: Center For Security Policy