VideoThe sounds of animals thought to be silent...until now A new study has discovered 53 vertebrates previously considered non-vocal, do in fact engage in vocal communication Video
HealthWeight loss advice isn't based on good evidence The orthodoxy in most high income countries is that anyone with a body mass index (BMI) of 25 or more is overweight, but evidence suggests the cut-off point should be a fair bit higher, writes Clare WilsonComment