CDC.gov (www.cdc.gov) is the official Web site of the Centers for Disease Control and Prevention (CDC). It is a public domain Web site, which means you may link to CDC.gov at no cost and without specific permission. CDC.gov provides direct access to important health and safety topics, scientific articles, data and statistics, tools and resources – and over 900 topics in the CDC.gov A-Z Index. Below are additional shortcuts to CDC.
“The National Aging Institute's Web site is an institute of the NIH, a U.S. Federal Government agency that provides accurate, up-to-date information about aspects of aging research, information about clinical trials, educational materials and resources about aging for the general public, and information for researchers and health professionals.”