Blood Flows to Your Head

    A lesson about blood flow and circulation

    A teacher was giving a lesson on the circulation of the blood. Trying to make the matter clearer, he said:

    "Now, students, if I stood on my head the blood, as you know, would run into it, and I should turn red in the face."

    "Yes, sir," the boys 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, "'It's because yer feet ain't empty."