If you happen to be working on a Halloween costume this week, remember two things: Nothing beats duck tape when you need to fashion a quick coffin or a knight’s shield, and if you do a really good job of it, you can enter the annual Stick or Treat contest first prize: a thousand bucks, which crowns the most innovative use of duck tape.

Wait—or is it duct tape?

Ah, yes, this time of year often gives voice to one of the world’s great unanswered questions: Is the proper term for America’s favorite waterproof, polyethylene and fabric-mesh strip adhesive duct tape or duck tape?

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