Which effect makes the average Earth's temperature around 15 degrees centigrade?

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What car company takes its name from the Japanese word for the constellation Pleiades?

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What playwright wrote "Death of a Salesman"?

What country borders Sierra Leone to the north?

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Whose sidekick was named Barney Fife?

What is the name of Drew Barrymore's character in the 1982 movie E.T. the Extra Terrestrial"?

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Which US president was born in Milton, Massachusetts?

What tanker ran aground in Prince William Sound, Alaska, on March 24, 1989?