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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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.
Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.