HIV is spread most commonly by sexual contact with an infected partner. The virus enters the body through the lining of the vagina, vulva, penis, rectum, or mouth during sexual activity. HIV may also ...

Scientists have long thought that babies can’t form experiential memories. Turns out, they can. Adults just can’t remember them.

Injuries to the lips and mouth Includes inner cheeks and the roof of the mouth (hard and soft palate) Front of the mouth includes the tongue. Also, includes the flap under the upper lip (frenulum).