Do female Florida alligators make the same loud roar as males do?

The loud roar of the Florida alligator (more appropriately called the American alligator) is part of the male's mating behavior and apparently not done by females. Both sexes do, however, hiss at enemies and each other. The female is most likely to be dangerous to humans when she is guarding a nest of eggs.

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Did Niagara Falls ever stop flowing?

Yes! On March 29, 1848, Niagara Falls ran dry. A South-West gale blowing off of Lake Erie caused ice to jam and dam up at the mouth of the Niagara River causing the water flow over the Horseshoe Falls and American Falls to be reduced to a trickle. On the morning of March 30, 1848, the river flow returned to its normal rate.

When did the first automated teller machines (ATMs) come into use in the United States and Canada?

The first ATM was installed in 1969 by Chemical Bank at its branch in Rockville Centre, New York.

How do mussels and oysters reproduce?

Mussels and oysters belong to the phylum Mollusca, class Pelecypoda. They lack a head and have a hatchet-shaped foot for burrowing. Their sexual reproduction is hermaphroditic, which means that each animal has both sexes. Two animals come together in copulation, each inseminating the other. Self-fertilization is prevented by the development of the testes and ovaries at different times. Oysters and mussels are first male, then female. (And you thought humans were weird.)

What was the longest song ever recorded and how long was it?

The Guinness Book of World Records states that The Devil Glitch, a 69-minute song containing over 500 verses, is the longest pop song ever recorded. It entered the record books in July of 1997.

What do the letters PRN mean on a prescription bottle?

This stands for pro re nata, which is Latin for "take as needed."

How do you remove scorch marks left by an iron on a carpet?

To remove light scorch stains from washable materials, sponge them promptly with cool water. Or soak them in cool water for 30 minutes, then work undiluted liquid laundry detergent into the stains and rinse. Light scorch stains on nonwashable materials can be removed by sponging the fabric with hydrogen peroxide (test first for colorfastness), then sponging with water. Scorch stains are almost impossible to remove from silk or wool. Brushing the spot on a thick wool carpet lightly with emery cloth or very fine sandpaper may improve its appearance, but the stain cannot be removed if the carpet fibers have been burned.

If all the gold that has ever been mined in the world were melted together to form one nugget, what would be the weight of that nugget?

The gold nugget would weigh 142,600 tonnes (metric tons). One tonne equals 1,000 kilograms, or 2,205 pounds. In other words, that nugget would be pretty big!

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