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This is the story of archemides
There was aking in ancient time .he said to any goldsmith to make a crown for him.goldsmith made that crow for him .he came to king and said that the gold used in making in this crow is 1kg.but the king has doubht that goldsmith is telling he call his famous minister archimid.he gave him the work to find truth.archimid spend about 8 months in finding this. one day when he was going to bath one day in tub suddenly some amount of water flow down of tub .then he think that why this water come out of it.then ho do so many experiment and found the archimids principle.