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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
Did you know?
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).
Did you know?
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Did you know?
The horizontal fraction bar was introduced by the Arabs.