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    4. The Reagan DoctrineUS Foreign Policy in Five Doctrines

    4/6How US policy changed towards the Soviet Union and the challenge of communism.

    3. The Nixon DoctrineUS Foreign Policy in Five Doctrines

    3/6How did the Vietnam War change America’s foreign policy?

    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?

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