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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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.
More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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).