An enthusiastic biology teacher saw an unenthusiastic classroom So he wanted to do something He went and stood on his head on top of a table and asked "can you see my face is getting all red?" The children said yes He gets off and says "When I stand on my head, all the blood moves into my head region and my face gets red. But when I stand on my feet it does not happen, why?" One little boy stood up and said "because the feet ain't empty" \-Sadhguru