hold a straw on its sides. Try jabbing it into a potato. Then place the index finger over on end of the straw. Rapidly jab the straw through the potato, being careful to hit the potato squarely with the straw . How can a straw go through the potato?
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when you put you index finger at one end of the straw then hit the potato with the other end of the straw then the air which is already present inside the starw could not get a way to come out of state and thus make the straw hard and the straw goes into the potato.
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