What started in 1849 when gold was discovered at Sutter's Mill?

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What doll was patented by John Barton Gurelle in 1915?

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Christmas Island is a territory belonging to which country?

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How wide is the average bolt of lightning?

How many millimeters are in an inch?

With what is sulfur and saltpeter mixed to make gunpowder?

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What city hosted the 2012 Summer Olympics?

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A "peck" is how many imperial quArts?

In chronological order, what is the first book in the Chronicles of Narnia series?