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Did you know?

Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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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.

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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

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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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As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Acute exacerbations of asthma can require management in the emergency department. The child is place Acute exacerbations of asthma can require management in the emergency department. The child is place
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Video: Elementary kinetics

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