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What does fracking involve and what impact does it have on the environment?
BBC World Service Online
How robust is GPS and what are the consequences of the system's weaknesses?
Professor Alan Watson has spent 40 years trying to unravel the mysteries of cosmic rays
How deep brain stimulation is treating Parkinson's and depression
Professor Noel Sharkey on the strengths and limititations of robots and AI
Do e-cigarettes really help smokers quit and are they safe?
Can scientists bring extinct animals back from the dead?
The impact of the search for the Higgs boson on science teaching in Africa