Editor's choice
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Ebola: research team says migrating fruit bats responsible for outbreak
A toddler's chance encounter with one infected bat in Guinea led to west Africa's present epidemic
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Rare flu strains could be key to super-vaccine
Research suggests that unfamiliar flu strains cause immune system to release broadly effective antibodies
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Scientists hail creation of working organ made from laboratory cells
British scientists produce working thymus, a vital immune system 'nerve centre' located near the heart
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Galileo GPS satellites launched into wrong orbit
Setback for European-run navigational network as space agency announces satellites missed their target positions