The cervix is a ring of muscle at the top of the vagina. It is the entrance to the womb. During childbirth the cervix expands until it is wide enough to let the baby out. The surface of the cervix facing into the vagina is covered with a type of skin which can become cancerous.
It [...]
Recent research indicates that your saliva contains a chemical called opiorphin, which is six times more effective than dangerous narcotics such as morphine yet lacks the addictive and psychological side effects.When the researchers subjected test rats to a painful stimulus, 1mg of opiorphin per kg of body weight achieved the same painkilling effect as 3mg [...]