Vivienne Parry explores the crucial role the hormone leptin plays in the body.
BBC World Service
1/2 Shahzeb Jillani explains how the 1971 war over Bangladesh shaped modern Pakistan.
Melvyn Bragg and his guests discuss the Japanese belief system Shinto.
4/5 A mother whose son grew up apart from her emerges from 37 years of denial.
BBC Radio 4
The story of one of the most controversial documents in US diplomatic history.
Ed Butler investigates abuse of children and scamming of volunteers by Bali's orphanages.
5/15 In the early 1800s, the post office operated an expensive and illogical payment system.
29/30 Brett Westwood investigates fungi with tights, or the attack of the powder cap strangler!
4/15 Introduced in 1784, the mail coach slashed journey times by two thirds.
3/15 During the 18th century, an expanding postal network offered new possibilities.