The deepest place in the ocean is about seven miles deep.

The first commercial chewing gum was sold in 1848 by John B. Curtis, who also made the gum. He called the gum "State of Maine Pure Spruce Gum."

The first known transfusion of blood was performed as early as 1667, when Jean-Baptiste, transfused two pints of blood from a sheep to a young man.

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