While in the field, mothers being surveyed about their use of solid fuel cook stoves could also be asked a few questions about their use of kerosene for lighting.

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Another is to use powerful solar cells to collect sunlight in conjunction with an efficient solid oxide fuel cell.

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But solid-oxide fuel cells are hardier and offer far more punch because they can use denser hydrocarbons as fuel.

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The advantage of solid oxide fuel cells running so hot is that all that waste heat can potentially be put to good use.

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