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In 1864, the first barbiturate (barbituric acid) was synthesized.
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).
Vaccines prevent between 2.5 and 4 million deaths every year.
It is important to read food labels and choose foods with low cholesterol and saturated trans fat. You should limit saturated fat to no higher than 6% of daily calories.
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.