Hopes of discovering life on Venus have been dampened somewhat as the sheer scale of the task becomes clear. But don’t get in a slump just yet, because Mars has come out fighting...In the pod this week are New Scientist journalists Rowan Hooper, Cat de Lange, Leah Crane and Graham Lawton.The team explains how scientists have confirmed the existence of a huge underground lake of liquid water on Mars. Surrounded by smaller ponds, this news has reinvigorated those eager to find signs of alien life on the Red Planet. Also, the team assesses the impact of different diets on your biological age, with the news that going paleo - eating like a caveman or cavewoman - may make you older than your years. And, as we all become increasingly aware of the extinction crisis, the team reveals the identity of the world’s most endangered group of animals. They also discuss herd immunity and the latest coronavirus news, and share news of an exoplanet discovered in a galaxy far, far away.To find out more, subscribe at newscientist.com/podcasts. Our GDPR privacy policy was updated on August 8, 2022. Visit acast.com/privacy for more information.