Quartz of them, at least.
Back from vacation, delayed a little by Snowpocalypse 2010 II: The Wrath of James Caan (It’s NOT Snowpocalypse 2010; that was the storm in February). I didn’t know how much snow the DC area would get and it seemed foolish to drive in during the storm or just as the cleanup were to begin. (And the part of abandoning my mom with whatever snowfall was there. That would have been bad). Turns out that DC got almost nothing — it had all melted by Wednesday evening — and Niskayuna got around 6″ (an amount easily handled), though you didn’t have to travel too far to find pockets which had gotten a foot or more, especially up in the hills. Further south and east got dumped upon. My route back, which was inland (Rt 88 to 81 to 15 to the beltway), was all clear.
So here’s a video about how a quartz watch works, which I found via fine structure