LifeGeorge Church: The maverick geneticist now wants to reverse ageing He stirred controversy with his plans to bring back the woolly mammoth. But first he's working on editing sperm – and trying out his ageing reversal techniques on dogs Features
HumansThe truth about intelligence: Can I become cleverer? Brain-training is thriving despite doubts it can actually boost your smarts. But there is a way to increase your IQ score and keep your brain sharp for longer Features