Unless you’re a scientist or engineer, there’s really no need to have a second calculator on your phone—unless you’re using ...

The calculator’s “C” button—the one that clears input—was gone. The “C” itself had been cleared. The “C” button’s function is vestigial. Back when calculators were commercialized, starting in the ...

But let's say you are a taxi driver who encounters passengers who sometimes have trouble working out their taxi fare and the change they are owed. This would be the most practical way of using a car ...