 In "Methuselah's Children", Long mentions visiting Hugo Pinero, the scientist appearing in Heinlein's first published story "Life-Line", who had invented a machine that precisely measured lifespan.Pinero refuses to reveal the results of Lazarus's reading and returns his money.The promotional copy on the back of "Time Enough for Love", the second book featuring Lazarus Long, states that Lazarus was "so in love with time that he became his own ancestor," but this never happens in any of the published books.