A teacher was giving a lesson on the circulation of the blood. Trying
to make the matter clearer, she said, "Now, class, if I stood on my
head, the blood, as you know, would run into it, and I would turn red
in the face..
" "Yes," the class said. "Then why is it that while I am standing
upright in the ordinary position the blood doesn't run into my feet?"
A little fellow shouted, "Cause your feet ain't empty."
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