Some algae cells are also easier to filter than others, reducing the energy and economic cost of "harvesting" the algae from cultures.

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By contrast, energy companies run their turbines continuously at constant speeds and filter the air intake against damaging particles.

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They filter out the things that are going up, food and energy.

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They have long been employed in devices like mobile phones to filter electric signals (which can be done by converting electrical into mechanical energy and back again).

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It would also greatly reduce energy costs, since reverse osmosis involves forcing water through filters to remove minerals, and the Perforene filter is so thin that much less pressure is required (graphene is a thousand times stronger than steel).

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"Some of the filter results show levels slightly higher than those found by EPA monitors last week and a Department of Energy monitor the week before, " the agency said.

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