More from Helen Knight
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Earth
Bugs will give us free power while cleaning our sewage
News
Earth
Green machine: Generating more light than heat
News
Earth
Green machine: Cheaper home power from sunlight
News
Earth
Cactus gum could make clean water cheap for millions
News
Earth
Green machine: Power from the people
News
Earth
Green machine: Rethinking internal combustion engines
News
Earth
Texas oil companies will soon be locking away carbon
News
Earth
Renewable energy: Electric dreams
Features
Earth
Renewable energy: Will the lights stay on?
Features
Health
Genetic search closes in on ‘Alzheimer’s mutation’
News
Life
Review 2006: Watch yourself on the WWW
News
Technology
North Korea resumes missile testing
News