SpaceIs our cosmos just a membrane on the edge of a far stranger reality? String theory may be our best attempt at a theory of everything, except that it can't describe an expanding universe like ours. Now a radical new twist on the idea could finally fix that – but it requires us to completely reimagine reality Features
HealthWhy the world’s longevity hotspots may not be all they seem Blue zones, places home to an unusual number of centenarians, are looked to for their secrets to living healthier lives – but are they even real? Features