Watches. A lot people used to wear them, because a watch had two great functional purposes: giving you the current time instantly, and providing a quick, easy, and almost universally recognized way to socially cue that you're becoming impatient / need to go / it's getting late. A lot of people actually still wear watches, but by and large, the reason has changed - it's mostly about fashion. For some people, maybe it was always about looks, but now more than ever the watch is, in any functional sense, obsolete. We carry smartphones, and those do a lot more than just give the time.

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