HealthI'm travelling the world to collect poo for the good of humankindEric Alm is racing to find out which gut microbes thrive in diverse human cultures before it is too late. His microbiome library – derived from faecal samples – could help solve future health crises Features
LifeRewilding: Can we really restore ravaged nature to a pristine state? Vast tracts of land are returning to wilderness as farming retreats worldwide. But rewilding isn't an easy win – and debates rage about how to manage it Features