Rubik's Clock Rubik's Clock Rubik's Clock is a mechanical puzzle invented and patented by Christopher C. Wiggs and Christopher J. Taylor. The Hungarian sculptor and professor of architecture Ernő Rubik bought the patent from them to market the product under his name. It was first marketed in 1988. Rubik's Clock is a two-sided puzzle, each side presenting nine clocks to the puzzler. There are four wheels, one at each corner of the puzzle, each allowing the corresponding corner clock to be rotated directly. (The corner clocks, unlike the other clocks, rotate on both sides of the puzzle simultaneously and can never be
-gry puzzle the answer "gry," an obsolete unit of measure invented by John Locke. It is unclear whether this was the answer given on the Grant show, or what the precise wording had been. By fall 1975 the puzzle had reached the Delaware Valley, again apparently by radio, by which time the puzzle seems to have mutated to a form in which the missing word is an adjective that describes the state of the world. The puzzle has had occasional bouts of popularity: after its initial popularity in 1975, it was popular in 1978, then again in 1995–1996. The most credible report