LifeOctopuses prompt rethink of why animals evolve big brains A popular idea suggests a link between big brains and a rich social life, but octopuses don't fit the pattern, which suggests something else is going on News
LifeSperm's evolutionary origins go back before multicellular animals Analysis of the DNA and proteins of a range of animals has revealed that sperm’s molecular toolkit arose in our single-celled ancestors, perhaps more than a billion years ago News