In episode three of our series Destination Mars, we finally arrive at the Red Planet - but what is waiting for us when we get there? We examine possible solutions to the challenges of building a home on an alien planet, including a Star Trek-inspired health scanner and bacteria that can be engineered to grow rocket fuel. Plus, the science headlines from around the world: a brain scan for epilepsy, the bees that are addicted to caffeine and the science behind hallucinations.