Question: To saw a piece of wood in half,

  Options: 
 A. take a hand saw and drag the smooth end of it back and forth over the wood until you cut all the way thru all the while holding the wood down with the other hand.
 B. take a hand saw and drag the teethed end of it back and forth over the wood until you cut all the way thru all the while holding the wood down with the other hand.
Answer: B