We will spring forward this weekend. And with clocks on our minds, I got to see some unusual clocks in Koblenz, Germany.

[WilkoL’s] clock though has a most unusual clock source: a 440 Hz tuning fork. A cheap plastic dome really shows off the fork and contributes to this good-looking build. An ATTiny13 divides the ...

Albert Einstein is experimenting with two unusual clocks which both have 24-hour displays. One clock runs at twice the normal speed. The other clock goes backwards, but at the normal speed.