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That's the light-emitting diode, or LED, which is becoming increasingly prevalent in items ranging from on-off switches to taillights and traffic signals.
Despite their on-off relationship, the boy from Dundalk asked the girl from Lurgan to wed and she accepted.
Such an on-off switch could be useful to surgeons - but don't look for human experiments anytime soon.
And for all the talk of his on-off affair with Scotland, the rucks, the barneys, the therapy and the revelations, he's still a national treasure.
After a stormy on-off relationship, the couple married in 1995.
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