Grav-mass
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Grav-mass is Richard Stallman's parody of Christmas. He describes it as follows: On December 25, Isaac Newton's birthday, we celebrate the existence of comprehensible physical laws. Remember, Gravitation is a well-established scientific theory, but Intelligent Falling is just religion pretending to be science.[1]
Newton's birthday is 4th January 1643 according to the modern Gregorian Calendar, but was on Christmas according to the Julian Calendar in effect in England until the calendar reform of 1752[2].