Build Your Own Binary Clock

For the electronically-minded, a binary clock tutorial. John Hall has built several different versions of a clock that tells time in binary. Each iteration of his binary clock uses LED lights to represent different powers of 2. Several other backyard binary scientists have also submitted pictures of their own binary clocks. There's even a picture of the circuit board from inside the infamous ThinkGeek binary clock (manufactured by Anelace)...

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Four Bits is a Nibble

"The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ... the binary system is used internally by virtually all modern computers. " - Wikipedia