Aumann’s agreement theorem, roughly speaking, says that two agents acting rationally (in a certain precise sense) and with common knowledge of each other’s beliefs cannot agree to disagree.

—LessWrong Wiki

In other words, when two truth-seeking individuals share information, they approach the same beliefs.

Sometimes, when I’m in a discussion with others, I remember Aumann's agreement theorem. To me, it’s an ideal: Whenever we discuss facts about the world, we should approach agreement. Otherwise, we're failing. This ideal assumes that we are:

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At Empiricast, we're trying to help organizations make better decisions by working scientifically with forecasting.

At the request of a potential client, we wrote a white paper where we describe our approach and the scientific foundations we’re building upon.

… the rise of the electric scooter is part of a broader and welcome phenomenon: the gradual retreat of the car from the European city. Across the continent, apps and satellite-tracking have spawned bike- and scooter-rental schemes that allow city-dwellers to beat the traffic. Networks of cycle paths are growing and creeping outwards; that of Paris will by next year have grown by 50% in five years. Municipal governments are lowering speed limits, introducing car bans and car-free days, pedestrianising streets and replacing car parks with bike parks.

—The Economist's Charlemagne

This is fantastic. A recent trip to the US—where cars reign supreme—only strengthened my conviction that cities are a lot better without cars.

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Free Solo is a 2018 National Geographic documentary by Elizabeth Chai Vasarhelyi and Jimmy Chin. It’s a behind-the-scenes look at Alex Honnold’s attempt at climbing El Capitan without a rope. The movie is full of interesting insights and observations about excellence, performance, honesty and the tension between masculine and feminine ambitions.

Spoiler alert: If you haven’t already watched the movie, I highly recommend you do before reading more or even watching the trailer. (If you’re in Norway, you can watch it for free at the Norwegian Broadcasting Corporation’s website until December 14, 2019.) If you’re not yet convinced, let’s see if the trailer moves your needle:

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You miss 100 percent of the shots you don’t take.

—Wayne Gretzky (probably)

Rejection is better than regret. This is true in many areas—for example:

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As a rule of thumb, the more aligned incentives are, the better. When you’re dealing with someone whose incentives are aligned with yours, you can usually trust that they’ll do you good.

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The Encyclopedia of Mathematics:

Imagine you are a guest in a TV game show. The host, a certain Mr. Monty Hall, shows you three large doors and tells you that behind one of the doors there is a car while behind the other two there are goats. You want to win the car. He asks you to choose a door. After you have made your choice, he opens another door, revealing a goat. He then asks you whether you want to stay with your initial choice, or switch to the remaining closed door. Would you switch or stay?

This is a fascinating paradox. For a good explanation of the solution, see montyhallproblem.com.

On the 14th of April 2019, the Jordan B. Peterson Podcast starred Akira the Don. It’s a fascinating conversation that covers a range of topics.

I’ve found Akira the Don’s music very helpful, especially his album The Path with Jocko Willink. (Willink is a man you don’t want to let down.)