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Whilst most men become fathers, and men make up roughly half the parental population, the vast majority of scientific research has focused on the mother.But studies have started to reveal the impact of fatherhood on both dads themselves and on their children. We're seeing how fathers play a crucial role in children's behaviour, happiness, and even cognitive skills.Oscar Duke, a doctor, new dad and author of How To Be A Dad, discovers how pregnancy, birth and childcare affect the father, bringing about profound physiological and hormonal changes. Only 5% of mammal fathers invest in their offspring, and human males have evolved to undergo key changes when their children are born.Involved fathers can expect their levels of the 'love hormone' oxytocin to rise, nature's way of helping parents bond with their children. At birth, a dad's testosterone levels dramatically fall, increasing affection and responsiveness, and discouraging polygamy.With more fathers taking on a hands-on role in bringing up their children, how can these new discoveries about the science of dad help support them, and inform social and healthcare policies?Presented by Dr Oscar Duke and produced by Melanie Brown and Cathy Edwards

Stanley Tucci continues his history of California with the story of Silicon Valley's troubled founder, William Shockley.Shockley was the man who first brought silicon to Silicon Valley in the 1950s. He was an undoubted genius. But he was also a hideous boss and an irredeemable racist.California wants to dazzle you with its endless sunshine and visions of the future – but that’s just a mirage. Stanley Tucci plays a hard-boiled screenwriter uncovering the full, sordid truth. He knows exactly where all the bodies are buried.Academic consultant: Dr Ian Scott, University of ManchesterWritten and produced by Laurence Grissell

The value society places on physical appearance has never quite made sense to blind presenter Lyndall Bywater and yet she's intrigued to discover why it matters so much to those of us in the sighted world. How much of an advantage is it to be beautiful? And what is physical beauty anyway? We've heard about the gender bias, the age bias, and the racial bias but few people talk about the beauty bias and yet it's one of the very first judgements we make when we meet someone. In this programme Lyndall explores this invisible force that controls how we behave - and reveals that when it comes to physical beauty, we all unconsciously discriminate. Producer: Sarah Shebbeare Researcher: Robbie Wojciechowski