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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
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The average office desk has 400 times more bacteria on it than a toilet.
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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.
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The longest a person has survived after a heart transplant is 24 years.