The latest results could have implications for the development of new anti-ageing therapies.
The scientists said that this knowledge may help to deter some people from taking up the habit or help others to quit.
Before sending humans to Mars or the moon, scientists need to understand what long-term space living does to the human body. Now results are coming in from the Kelly brothers in the TWINS Study.
A growing number of clinics offer blood transfusions that use the plasma of young donors to treat symptoms of aging, and other serious health conditions, such as dementia and heart disease.
The research was "the first" to directly target and "dramatically" reduce numbers of dementia-causing particles.
Although people claimed to remember events from infancy and toddlerhood, scientists widely believe earliest memories stem from roughly 3 to 3 and a half years of age.
Researchers investigated the link between junk foods, ageing and markers of Alzheimer's disease in the brain.
Scientists hope their research could explain why some people develop conditions that affect pigmentation in the body, including the skin disorder vitiligo.
The oldest person of all time was Jeanne Louise Calment from France who lived to 122 years and 264 days between 1875 and 1997.
Among other things, the new tomatoes contain nearly 500 percent more vitamin E than their unenhanced counterparts.
"When I saw some of the cells in the culture dish rejuvenating I couldn't believe it. These old cells were looking like young cells. It was like magic."
With a severely restricted immigration policy, Japan is now suffering from a lack of low-skilled workers, especially in the health services.