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34-byte Universal Machine
N. Megill writes: "Computer scientist and obfuscated code aficionado John Tromp has devised what may be the world's most compact Universal Machine (Postscript research paper) to date. Written in the 'S-K combinatory logic' language, which has only 2 commands (S and K), his UM can be encoded with only 272 bits (34 bytes), compared to 5495 bits for the Universal Turing Machine given in Roger Penrose's book The Emperor's New Mind ."