Scientists believe that the changes taking place may affect the effectiveness of drugs, so when prescribing medications, doctors need to take this into account.
Arsenic is a fairly strong poison that has been known to mankind for a long time, but recent research by scientists has shown that it can also be a medicine.
Cold sores caused by the herpes virus type 1 increase the risk of developing Alzheimer's disease in the future - this is the conclusion reached by a group of specialists at one of the Swiss universities.
