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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
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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.
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To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
Electron Transport Chain
Scorpions, Spiders and Sharks: Electron-Microscope Images
Electron sharing in covalent bond
A color-enhanced scanning electron micrograph of a neuron cell body (grey) studded with terminal ...
Constant velocity versus positive velocity
Population age 65 and over and age 85 and over, selected years 1900-2008 and projected 2010-2050.