Songbirds in the city, such as the Great Tit (Parus major), are learning to sing their mating calls at a higher pitch to cut through the urban clamour. But while this may help them be heard, the different tune may hamper their mating success.Sugar is today's popular dietary villain, but does it make sense to demonise a single nutrient? Dr Alan Barclay from the Dietitians Association of Australia explains why we shouldn't just follow the latest fads.Just because a scientific study gets a result, that doesn't mean it's true. The Reproducibility Project tried to replicate 100 psychology papers, and only 36% got a significant result (consistent with a recent high-profile retraction of a paper about canvassing support for same-sex marriage). As John Ioannidis pointed out in 2005, most published research findings are false, and the best way to improve this is to try to remove bias and do larger studies with more statistical significance.