Did you know?
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).
Did you know?
Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Your heart beats over 36 million times a year.
Did you know?
Asthma cases in Americans are about 75% higher today than they were in 1980.
School-age children are often independent and industrious, with a developing sense of self-confidenc
"Dark Matter"
How to find the equation of a line that is perpendicular to a line passing through a point
World Aquaculture Production "لإنتاج العالمي لتربية الأحياء"
To find derivative us the chain rule
Typical pattern of the stages of labour for first births and subsequent births