Life Line is one of Heinlein's earliest science fiction stories, about a man who builds a machine that will predict how long a person will live. Professor Pinero's invention has a powerful impact on the life insurance industry, as well as on his own life.
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... households, and 1,223 families residing in the town. The population density is 1,433.7/km² (3,704.7/mi²). There are 1,494 housing units at an average density ...