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Researchers in the USA trial a possible treatment for Alzheimer's disease on monkeys, surgically implanting cells that produce nerve growth factor that could halt neuron deterioration. Surgeons in Singapore separate twins conjoined at the head and brain. Doctors at John Hopkins School of Medicine, USA, report that retroviruses could be one of the factors causing schizophrenia. New type of solar cell developed at Loughborough, UK. Why science is failing to address issues of global change.