How can you hear a heartbeat?

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Obtain two small funnels and a length of rubber tubing about one or two feet long. Into each end of the tube, place the snout of one of the funnels. Now, place the rim of one funnel on the chest of a friend, and place the other funnel to your ear. The 'lub-dupp, lub-dupp, lub-dupp' you hear is the sound of your friend's heart opening and clossing. A doctor listens to the heartbeat in a similar way, by using a stethoscope.