Conservation and saving species go under the spotlight this week as Henry Nicholls draws attention ot the plight of Lonesome George, the last giant tortoise of his kind, David Aldridge discusses the problem of invasive species and how he is purging freshwater ecosystems of zebra mussels with a poison pill, Chris interviews Rick Shine about the wave of invasive cane toads legging it across Australia, from waves to the ocean, Helen Scales discusses the issues behind marine conservation, and sticking with the watery theme, Derek Thorne whips up a storm in Kitchen Science.