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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.
Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.

