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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.