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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.
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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.
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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
Ganzfeld experiment
Abiogenesis Experiment
Optical and Radiation Pyrometry Experiment
The Milgram Obedience Experiment
The line with the equation y=5x+12 intersects the parabola with equation y=xsqared+7x-3 at the ...
Number line (real numbers)