I don't know

 I teach medical students and graduate students that when "I don't know" is the correct answer, use it.

"Is eight-tenths of a second, on a dark night with a shaky light, enough time for a trained police officer to realize that the gun he saw a moment earlier—which he didn't see being tossed away—is no longer there? I don't know." https://jabberwocking.com/how-long-is-eight-tenths-of-a-second/

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