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John Graham-Cumming, of Geek Atlas fame, has posted a piece to answer the perennial question “Why do Christmas lights all go out when one bulb blows?” (the old-school in-series non-LED variety). And he shows ye ol’ “binary chop” technique for quickly rooting out the dead bulb.

Why do Christmas lights all go out when one bulb blows? (and how to find the broken one)