Try out my quantum mechanics course (and many others on math and science) on https://brilliant.org/sabine. You can get started for free, and the first 200 will get 20% off the annual premium subscription. What would it mean if effects come before their causes? Today, I have a closer look at retrocausality in general and the Transactional Interpretation of Quantum Mechanics in particular. This paper is a good starting point to learn more about this: https://arxiv.org/abs/quant-ph/0508102 💌 Sign up for my weekly science newsletter. It's free! ➜ https://sabinehossenfelder.com/newsletter/ 👉 Support me on Patreon ➜ https://www.patreon.com/Sabine 📖 My new book "Existential Physics" is now on sale ➜ http://existentialphysics.com/ 🔗 Join this channel to get access to perks ➜ null 00:00 Introduction 00:25 Space-time Causality 02:46 Interventionist Causality 05:46 Retrocausality and Time-travel 09:36 The Transactional Interpretation 16:51 What does it mean? 17:56 Sponsor Message