UnderstandEpisodes Available now

10. Unknown unknowns—The Trip
10/10What more is there to learn about psychedelics? Tim Hayward makes a case for curiosity.

9. Sacred plants for sale—The Trip
9/10Who stands to profit from the commercialisation of psychedelics?

8. A tipping point?—The Trip
8/10Significant barriers exist for research looking at psychedelics. Is that about to change?

7. Fascination and taboo—The Trip
7/10Psychedelic drugs have a chequered history. How did wonder turn to fear?

6. Critical periods—The Trip
6/10Can psychedelics help the brain to learn things anew?

1. Altered States—The Trip
1/10Tim Hayward looks at the science, culture, history - and future - of psychedelics.

5. Message in a bottle—The Trip
5/10Tim Hayward travels into the past to better understand today’s psychedelic research.

4. Looking for a cure—The Trip
4/10Tim Hayward investigates why people are travelling abroad seeking a psychedelic cure.

3. Stranger things—The Trip
3/10Tim Hayward visits the outer reaches of cutting edge psychedelic research.

2. When the drugs take hold—The Trip
2/10Tim Hayward investigates the anatomy of a trip.