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    2. The Truman DoctrineUS Foreign Policy in Five Doctrines

    2/6What impact did WWII have on US policy towards the rest of the world?

    1. The Monroe DoctrineUS Foreign Policy in Five Doctrines

    1/6What is the 1823 doctrine, and how has it been used since by US presidents?

    TrailerUS Foreign Policy in Five Doctrines

    1/6Justin Webb looks at five big US foreign policy shifts, from Monroe to Trump.

    10. Unknown unknownsThe Trip

    10/10What more is there to learn about psychedelics? Tim Hayward makes a case for curiosity.

    9. Sacred plants for saleThe 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 tabooThe Trip

    7/10Psychedelic drugs have a chequered history. How did wonder turn to fear?

    6. Critical periodsThe Trip

    6/10Can psychedelics help the brain to learn things anew?

    1. Altered StatesThe Trip

    1/10Tim Hayward looks at the science, culture, history - and future - of psychedelics.

    5. Message in a bottleThe Trip

    5/10Tim Hayward travels into the past to better understand today’s psychedelic research.

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