If you swap the hour hand and the minute hand on an analog clock, how many possible valid times can it still display? For example, typical clocks sometimes have both hands pointing at the 12 ...

Have any last-minute projects you finished just before the end of the decade? To help pass the time, [Erich Styger] decided to build a meta digital clock made up of 24 individual analog clocks ...

When the minute hand on a clock moves from one number to the next, it has moved 5 minutes. There are 12 numbers around the clock face, and each interval is 5 minutes… 12 × 5 = 60 minutes in an ...