The knot also needs to be adapted for common two-core electrical appliance cable, if you remove a piece of the insulation on one side and with an offset on the other side, the cable needs to be twisted mid-knot to match the correct wire.
A lot of sentences undergo startling shifts in mood if you add 'like this one' to the end, but high on the list is 'I'm a neurologist studying dreams'.
Wikipedia (Near-Earth Supernova) says that a 25 ly away supernova would wipe out half the ozone layer so that's probably the lower bound for what we want
xkcd
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