Counter-Intuitive Science

jar admonishes: ...but Dr. A did not reply saying "...wrong, not the answer."He might have missed it.
That was my first thought as well.Here's my second thought:Just as the people in front of Dr. A were walking through the entrance door, the store manager, having given his warning to the shoppers inside that it was time to close, noted that it was in fact now time to close and hit the switch that locked the entrance doors just fractions of a second before Dr. A stepped on them.

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- xongsmith, 5.7d

It would be helpful if Dr. A could wag his finger at jar & myself, saying something like "Nice try, but Wrong."Another possibility that would get a round of boos is that the door-opening mechanism broke just after the people in front got in.
"Boo" if that's case, although, if this was a real-life event, then it's okay. But I do see it as a riddle. Perhaps that assumption is False.

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- xongsmith, 5.7d

Ah - thanks, Panda!Again I did not read the exact words in front of my eyes. I glossed over that & thought all the jumping in the world wasn't opening that door. (He even put it in a little parenthesized clause which should have drawn my attention.)

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- xongsmith, 5.7d