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The Black Pits of Luna

The Black Pits of Luna is a science fiction short story by Robert A. Heinlein about a boy scout on a trip to the moon and his novel way of finding his lost brother.

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Urethra

... Contents Urethra In anatomy, the urethra is a tube that connects the urinary bladder to the outside of the body. The urethra has an excretory function in both sexes, to ...