HealthHow can you ensure that your life is worth living? Dramatic advances in communication with people in a minimally conscious state have provoked questions central to our ideas about what makes life worth living Leader
LifeThe world's weirdest whale: Hunt for the sea unicorn With its spiralled horn and elusive ways, the narwhal is a thing of legend. Isabelle Groc joins an expedition braving Arctic waters to meet it face to tusk Features