A look through 45 years of Horizon archive to see how science came to understand sex.
5/10 Presenter Emma Willis's family history leads her down two very different paths in Ireland.
Mim Shaikh goes on a deeply personal journey to find his missing father.
6/6 As the journey draws to an end, will the group bond or break?
Three families face new cooking challenges as they compete for a place in the play-offs.
Riaz Khan explains why looking after his parents under their roof is a family duty.
19/20 Chris and Debs Wilson from Wilberfoss consider settling in Australia.
Stacey Dooley meets those on the frontline of Hungary's child protection system.
5/6 Riyadh Khalaf explores the world of queer porn.
Anick's doctors didn't know if he was a boy or a girl. Then he found out he was intersex.
BBC Radio 1