Since the 1930s scientists have proposed food restriction as a way to extend life in mice.

Resveratrol, a compound in grapes, displays antioxidant and other positive properties.

Rapamycin, a drug that keeps the immune system from attacking transplanted organs, may have another exciting use: fighting Alzheimer's disease.

A novel finding, described today (Feb. 4) on the Science Express Web site by teams from the National Cancer Institute, The University of Texas Health Science Center at San Antonio and the University of Toronto, offers a clue as to how genes can have what you might call multiple personalities.