Applications for using a single pushbutton to advance a circuit to its next logical state are legion. Typically, there are just “on” and “off” states, but there can be more. The heart of the circuit ...

The last time a thong was glimpsed at the White House, it was clinging to the backside of Monica Lewinsky. But recently thongs of a different sort—the shoes more popularly known as flip-flops—appeared ...