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Asthma cases in Americans are about 75% higher today than they were in 1980.
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 attacks and symptoms usually get started by specific triggers (such as viruses, allergies, gases, and air particles). You should talk to your doctor about these triggers and find ways to avoid or get rid of them.
The horizontal fraction bar was introduced by the Arabs.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.