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Author Question: Economic development that meets the needs of the present without compromising the needs of future ... (Read 41 times) |
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.