Are mobiles phones linked to low fertility?

Every day the likes of probiotic "good" bacteria in yoghurts, and even the enzymes in washing powder, give us a helping hand. This week we investigate how scientists are designing new ways to protect and guard these tiny helpers, including new techniques to freeze-dry human blood. Plus, in the news, why mobile phones might be linked to low fertility, GM mosquitoes to wipe out malaria and diving beetle-inspired underwater stickytape...