Someday he envisions cancer centers storing giant banks of premade T cells to match the patients' bone marrow and tumor types.

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The company is also experimenting with a new way of storing the hydrogen that will fuel its cells a fabric made of fibres of activated carbon that can (when cooled with liquid nitrogen) soak up the same amount of energy per kilogram as petrol.

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Miniaturized direct methanol fuel cells are different batteries in that they create power instead of simply storing it.

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