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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).
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.
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A cataract is a clouding of the eyes' natural lens. As we age, some clouding of the lens may occur. The first sign of a cataract is usually blurry vision. Although glasses and other visual aids may at first help a person with cataracts, surgery may become inevitable. Cataract surgery is very successful in restoring vision, and it is the most frequently performed surgery in the United States.
Typical EKG tracing.
A typical engine design that uses both pressure and splash lubrication. Oil travels under pressure ...
A typical magnetic crankshaft position sensor.
A typical waveform of a TP sensor signal as recorded on a DSO when the accelerator pedal was ...
A typical fuel pulsator used mostly with roller vane-type pumps to help even out the pulsation in ...
Carnivorous plants of the genus Nepenthes grow in nitrogen-poor soil