know amazing uses of graphene i bet you have not read it. Graphene is a semi-metal with a small overlap between the valence and the conduction bands. It is an allotrope of carbon consisting of a single

HERE IS THE BRAIN TEASER. A man buys a horse for $60,then sells it for $70. He buys the horse back for $80, and then sells the horse for $90. How much money did he make or lose? comment the answer.......

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