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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

Paranasal sinuses are part of the upper respiratory system. Paranasal sinuses are part of the upper respiratory system.
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