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Scientists at the Harvard University School of Public Health examined 136 studies on cocoa and found that it boosts heart health due to its antioxidant chemicals known as flavonoids. The studies show that eating chocolate can lower blood pressure and bad cholesterol levels. Study subjects who ate white chocolate experienced no benefits, since white chocolate lacks cocoa -- and therefore flavonoids.

DEFINITION: (noun) A margin of freedom or variation, as of activity, time, or expenditure; latitude. SYNONYMS: margin, allowance, tolerance. USAGE: Lisa's parents gave her a lot of leeway with her curfew, but they expected her to finish all her chores before she left the house.

Chairman Mao proclaimed the People's Republic of China in 1949. His Great Leap Forward was an initially successful effort to establish a system of collective farms and small industry, but it eventually led to the starvation of millions of people. Mao also launched a massive purge to eliminate counterrevolutionary elements in the country's institutions. The movement led to the destruction of much of China's cultural heritage and the imprisonment of many Chinese intellectuals; what was it called?

A tsunami is a series of waves generated when a body of water is rapidly displaced on a massive scale. The deadliest tsunami in recorded history, the Indian Ocean tsunami, killed about 300,000 people. It was triggered by an earthquake in the Indian Ocean that registered between a 9.1 and a 9.3 on the Richter scale. The disaster prompted a huge worldwide effort to help victims of the tragedy. How far down the shores of the continent of Africa did the tsunami extend?

An o-ring is a loop of elastomer with a round (o-shaped) cross-section used as a mechanical seal. Successful o-ring joint design requires a rigid mechanical mounting that applies a predictable deformation to the o-ring. This introduces a calculated mechanical stress at the o-ring contacting surfaces. As long as the pressure of the fluid being contained does not exceed the contact stress of the o-ring, leaking cannot occur. Why did the o-ring of the Space Shuttle Challenger fail?