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What if real expertise makes you less certain, not more?
And what happens when we already know enough to act, but still don’t?
Thierry Courvoisier has spent a lifetime testing what we think we know. An astrophysicist and honorary professor at the University of Geneva, he created and led the science data centre responsible for ESA’s INTEGRAL gamma-ray satellite, and later became President of the European Academies Science Advisory Council, bringing scientific evidence into the world of public decision-making.
For Thierry, doubt is fundamental. You cannot think critically without it. But doubt everything, all the time, and you have nothing solid enough to move forward from.
That tension sits at the heart of this conversation.
We explore why genuine expertise can make it easier to say “I don’t know”; why many of humanity’s biggest challenges may no longer be problems of knowledge, but of judgement and action; and what happens when evidence meets short-term interests, competing priorities and systems that struggle to listen.
After more than 400 scientific papers, and years crossing oceans with his wife Barbara, Thierry’s perspective is refreshingly clear: listen widely, filter carefully, then decide.
Perhaps knowing more was never meant to make us more certain.
So throw on those running shoes, or grab that favourite beverage, and here is Thierry.
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