Summary: Chimps use gestures, climate change stops fish finding friends, gut cells reprogrammed to make insulin, and people prefer shocks to thoughts! Plus Saddle Up! - we look at the science of cyling as the Tour de France comes to the UK, including seeing how long an amateur cyclist can sustain Tour de France speeds, hearing how the bike came by its spokes, and visiting a wind tunnel to learn about the art of aerodynamics...
