LifeMystery of Australia's five-legged animals cracked The need to hop fast in open habitats seems to have driven the evolution of an odd habit in some of Australia's iconic marsupials, they use their tail as a fifth leg News
LifeHead and body lice splice their identical genes differently Head lice are harmless and body lice spread disease, yet they have the same genes – the difference could all be in the way they splice them together News