Today we explore the ageing process and the fresh claim that bacteria in our gut could hold the key to ageing with fewer of the health problems that come with it.

Discover how humans had been using trigonometry before Pythagoras came up with his now, textbook formula. And could robot killers be on the way? Experts are raising fears about the rapid evolution of AI and robotics and are calling for the technology to be banned. We find out precisely why. And finally, can science save the human race from the kinds of catastrophic disasters insurers dread the most?