In 1875, the director of the United States Patent Office sent his resignation and advised that his department be closed. There was nothing left to invent, he claimed.
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Elephant tusks grow throughout an elephant's life and can weigh more than 200 pounds. Among Asian elephants, only the males have tusks. Both sexes of African elephants have tusks.
A device invented as a primitive steam engine by the Greek engineer Hero, about the time of the birth of Christ, is used today as a rotating lawn sprinkler.
In 1986, a guard in an armored car was killed when $50,000 worth of quarters fell on him.
In Alaska, it is legal to shoot bears. However, waking a sleeping bear for the purpose of taking a photograph is prohibited.
Most dangerous of all avalanches, snow avalanches occur about a million times a year.
In one year, the average human heart circulates from 770,000 to 1.6 million gallons of blood through the body. This is enough fluid to fill 200 tank cars, each with a capacity of 8,000 gallons.