Withdrawing a slide rule from his pocket, the patient calculates rapidly, then swiftly packs up all his tools and turns back to the pedestrian, saying, “It is now precisely 3:29 pm, provided today is August 16th, which I believe it is.”
The man can’t help but be impressed by this demonstration, and sets his watch accordingly.
Before he leaves, he says to the patient, “That was really quite remarkable, but tell me, what do you do on a cloudy day, or at night, when the stick casts no shadow?”
The patient holds up his wrist and says, “I suppose I’d just look at my watch.”
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