91É«ÇéƬ

As an exercise in scientific navel-gazing, Georg Steinhauser’s experiment takes some beating. Starting in 2005, Steinhauser – then a chemist at the Vienna University of Technology – collected pieces of belly-button fluff from his navel and recorded their colour and weight

91É«ÇéƬ

91É«ÇéƬ

Hip replacement surgery is an operation to replace a damaged hip joint with an artificial implant

91É«ÇéƬ

91É«ÇéƬ

91É«ÇéƬ