The Hollow-Core Door Hypothesis

If you place an old hollow-core door out on the sidewalk, with a “Free Hollow-Core Door” sign on it, then every pedestrian that passes and reads the sign will gently knock on the door.

2 Responses

  1. But did you test the Solid Core Door Hypothesis?

    Ken - September 22nd, 2009 at 2:23 pm
  2. Well, there was a solid core door, but it was taken so quickly that there was no chance to collect any data.

    Chuck - September 22nd, 2009 at 3:30 pm

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