Would you set sail with a robotic skipper? This week, the World Robotic Sailing Championships grace the waters of Cardiff Bay, and we meet the teams to find out how this could lead to a sea change in robot science. Plus, we find out how robots are coming out of the factory and into the home, to care for the elderly and help children learn. In the news, stem cells restore hearing to deaf gerbils, facebook alters voting behaviour, and why a blue berry is the brightest thing in nature...