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lets make a very obedient bottle. you will require a huge plastic bottle, a rubber band,
a heavy metal nut. first with the scissors make a hole in the bottle lid. make a hole
also in the center of the base. with the scissors cut a 8cm long slit in the bottle. now take
a heavy metal nut and tie a long rubber band, first one knot and then a double knot to keep
it in place. take the metal nut and the rubber band and slip it into the bottle through the
slit. now pull out the rubber band with a cycle spoke hook. keep the rubber band in
place with the help of a match stick. this is towards the side of the lid. put another
match stick on the base. this is the final toy. now place this bottle on a smooth floor
and roll it. you will be surprised that the bottle automatically returns back to you.
this is because when you roll it the rubber band gets wound up and on returning, the rubber
band it rewinds. its like a spring which gets wind up and while rewinding the bottle returns.