Pop quiz: Can you tell what the device pictured above is? If you answered "a clock that represents the essential building blocks of a CPU while using binary and HEX numerals to display time," then you're certifiably crazy -- and correct. The brainchild of tinkerer extraordinaire Lior Elazary, the "CPU clock" mechanically emulates the application of computer concepts -- codes, instructions and checks -- to create a "simple" wall clock. To display the time, the middle register uses binary numbers read from bottom to top to indicate the hour (a reading of "0010" i
