Tires lose energy as heat through rolling friction, which is when a tire compresses. This reduces fuel mileage. Many things have been used to make tires stiffer and reduce rolling friction. The most recent discovery is silica. It's too expensive to extract and process silica from sand, so pirelli has discovered that small grains of silica also exist in rice husks. Rice husks, once a waste product, are now used as fuel. Now the ashes from burning rice husks, which used to be waste, are used for their silica.
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