Understand

The US Election: 2. The Campaign Trail

Following on from part one, which explained how the candidates are selected, part two looks at what happens on the campaign trail - and who's paying the bill?

NEW in Understand - The TripThe story of psychedelics. It's a unique moment. After decades of taboo and blanket illegality, policymakers and research institutions are taking these substances seriously. As a new dawn of psychedelic treatment beckons, Tim Hayward makes a personal journey into how we got here and where this is all heading.
 
Understand from BBC Radio 4 - unravelling the complexities of the biggest stories and subjects that really matter right now.