Iridium spark plugs - good buy!

[Coldrider]

Lightning is not that well understood, but stand well out of the way anyway.

[R-Soul]

Lightning is just electricity flowing in a circuit that is composed of conductive paths through air. Air is not very conductive, which is why you need a hell of a lot of voltage to get it through air in the first place.

Just like current splits up and goes through various paths in a parallel circuit, so does lightning. As I understand it, as more current goes through a path, it increases the resistance (actually impedance) in that particular path. eventually the resistance of that path is higher than the resitance along an laternative path, so some goes that way.

So IMO I reckon that plugs can be designed with similar resitsive paths, so that the spark splits into two. I dont see why not?