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  1. Many people know that any kind of trashes are useless. But I keep wondering are trashes really useless? I mean are their substance really can't reused or maybe recycled to make something new like energy or from chemistry perspective, can't we make useful substances from trashes'. I know some countries already imported trashes around the world and turned into something useful such as energy. What keeps me wondering is in the scale of home-industry, can't we use some of substances from some trashes (mixed trashes) and make something new? or maybe from certain trashes, like just papers or j
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