In 1936, the first practical helicopter was invented. It was the German Focke-Wulf Fw 61.

In the 14th century the Black Death killed 75,000,000 people. It was carried by fleas on the black rat.

The average lead pencil will draw a line 35 miles long or write approximately 50,000 English words. More than 2 billion pencils are manufactured each year in the United States. If these were laid end to end they would circle the world nine times.

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