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diet and exercise

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Earth

Brazil rides biofuel bandwagon to Africa

Brazil now meets 30% of its demand for automobile fuel with bioethanol – now its president tells the developing world to follow suit

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Light-harvesting nanowire could drive tiny devices

Technology

Light-harvesting nanowire could drive tiny devices

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Earth

Mechanical 'fish' could tap turbulence for energy

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Pentagon backs plan to beam solar power from space

Earth

Pentagon backs plan to beam solar power from space

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Earth

Go nuclear for a third industrial revolution, says EC

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Earth

Semiconductor uses the sun to split water

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Grass-munching bugs could charge rural phones

Technology

Grass-munching bugs could charge rural phones

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Rocks could be novel store for wind energy

Earth

Rocks could be novel store for wind energy

Features

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Life

Slaughtering animals is no way to stop disease

Opinion

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Health

HIV variant offers vaccine hope

Vital genetic clues that might lead to an AIDS vaccine have been discovered by researchers studying a less virulent form of the virus

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Earth

'Smart roofs' can keep you cool and save energy

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Life

HIV sequences cannot prove guilt

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Earth

Redesigned petrol engine promises green gains

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Technology

Computers learn to fly kites for renewable energy

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