Wolf pups are born deaf and blind while weighing around 0.5 kg (1 lb). It takes about 8 months before they are old enough to actively join in wolf pack hunts.

The first theatre to show motion pictures was the Nickelodeon on June 19, 1905 in Pittsburgh, Pennsylvania. It was opened by Harry Davis on Smithfield Street.

The postage rate for a letter in 1693 was determined through how much light could pass through the letter. The postage rate would be more expensive if less light went through, and this process was called candling.

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