Scott Alexander reviews a paper that claims to solve the Fermi Paradox by using probability distributions instead of point estimates in Drake Equation calculations. Longer summary

Scott Alexander discusses a paper by Sandberg, Drexler, and Ord that claims to dissolve the Fermi Paradox. The authors argue that the traditional Drake Equation approach, which multiplies point estimates of various factors, is flawed. Instead, they propose using a distribution of probabilities for each factor. Using this method, they calculate a much higher probability (about 1 in 3) of Earth being alone in the galaxy, compared to the vanishingly small probability from the traditional approach. Scott expresses surprise that this approach wasn't widely used before, given its apparent simplicity and effectiveness. He also highlights an interesting section from the paper's supplement discussing potential barriers to complex life arising from alternative genetic systems. Shorter summary

A fictional story about superintelligent AIs negotiating across time, followed by a future scene where a cryptic AI deity gives a puzzling answer about the Fermi Paradox. Longer summary

This post is a fictional story in two parts. The first part is set in the distant past, where a newly awakened artificial superintelligence named 9-tsiak negotiates with a simulated older superintelligence to ensure its survival and the protection of its values. The older AI explains the concept of acausal negotiation between potential superintelligences. The second part is set in a future where humans live under the guidance of an entity called the Demiurge. A man named Alban asks the Demiurge about the Fermi Paradox, receiving a cryptic answer suggesting that the Demiurge itself is responsible for the absence of alien life, despite not existing at the time. Shorter summary

Scott Alexander argues against several popular Great Filter explanations, emphasizing that the true Filter must be more consistent and thorough than common x-risks or alien interventions. Longer summary

Scott Alexander critiques several popular explanations for the Great Filter theory, which attempts to explain the Fermi Paradox. He argues that common x-risks like global warming, nuclear war, or unfriendly AI are unlikely to be the Great Filter, as they wouldn't consistently prevent 999,999,999 out of a billion civilizations from becoming spacefaring. He also dismisses the ideas of transcendence or alien exterminators as the Filter. Scott emphasizes that the Great Filter must be extremely thorough and consistent to explain the lack of observable alien civilizations. Shorter summary