3/3 Cecil Balmond examines the hidden geometry at the core of the Great Pyramid
BBC World Service
Miriam O'Reilly asks why since 9/11, so many European women have chosen to embrace Islam.
2/4 Steve Punt turns private investigator, examining little mysteries that amuse and beguile.
BBC Radio 4
5/5 Edi Stark finds out how the special bond between twins isn't always a happy one.
Sathnam Sanghera asks if being tone-deaf is a medical matter or simply a lack of training.
16/30 This week, the Horrid Ground Weaver - a creature found only in one place in the UK.
4/5 Edi Stark asks if being a twin helps or hinders development.
2/2 True social mobility means for every person who moves up, someone must move down.
3/5 We assume twins' lives will follow similar patterns, but what happens when one is gay?
Olivia O'Leary follows historian Theodore Zeldin in the quest to reform conversation.