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there are many things u can do with waste, it depends on your imagination and creativity. for ex- take 2 straws dip 1 in water and blow with another straw kept at 90 degrees at the top of the first straw, the water will rise up
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We can make so many simple machines through  waste depending on your imagination for eg-pulley
create a pulley with a grooved wheel & length of rope. attach the rope to the rod &  demonstrate  the pulley with a bucket of sand & rocks.  show the pulley can move the load up & down.
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