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South African activists and the government pledge to work together in the fight against HIV/Aids.

British scientists grow tiny sections of human liver from stem cells which could help in drug testing.

A vaccine to guard against hospital superbug MRSA is a step closer, according to scientists.

Women with a family breast cancer history are at higher risk even without inheriting faulty genes, a study says.

People who go to bed unhappy feel more energetic the next day, a study suggests.