PhysicsKissing by numbers: Party like it's n = 1999 Want the formula for a perfect party? Michael Brooks meets the mathematicians who can solve your social problems, from who to kiss to bathroom etiquette Features
PhysicsCosmic neutrino Muppets open unique window on universe First there were Bert and Ernie – now the detection of a whole host of astrophysical neutrinos has been confirmed, heralding an era of neutrino astronomy News