Ian Sample speaks to Richard Faragher, a professor of biogerontology at the University of Brighton, to discover what we know about the biological hallmarks of ageing in our bodies – and why we have evolved to have the lifespans we do

A series of super tusker elephant killings has sparked a bitter international battle over trophy hunting and its controversial, often counterintuitive role in conservation. Biodiversity reporter Phoebe Weston speaks to Amy Dickman, professor of wildlife conservation at the University of Oxford, about why this debate has become so divisive, and the complexities of allowing killing in conservation