Grav-mass
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Grav-mass is a fictitious, humor-laiden winter holiday established by Richard Stallman. It is celebrated on December 25 (in the New Style, January 4), Isaac Newton's birthday. Stallman's web site reads:
"Merry Grav-mass!
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 disguised as science."
[edit] Rationale
Stallman is an atheist and chooses not celebrate Christmas, which is a widely practiced religious and secular holiday in the United States and other countries.