HumansTo enjoy Robert Newman’s gig, park your scientific scepticism The campaigning comedian pricks scientific complacency well enough, but why doesn't he pick on targets his own size? Culture
LifeBusy doing nothing: How sloths mastered life in the slow laneOnce defamed as slow and stupid, sloths are now recognised as masterworks of evolution – and we could all learn from their energy-saving tricksFeatures