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Explore the most exciting new ideas and emerging concepts in science, health, technology and the environment with 91av’s exclusive in-depth articles, interviews and long reads.
DNA analysis of remains found at medieval sites has identified closely related strains of leprosy-causing bacteria in the bones of humans and a red squirrel
The level of protection against measles provided by the combined measles, mumps and rubella vaccine falls by a small amount every year, but remains high overall, according to mathematical modelling