Try out my quantum mechanics course (and many others on math and science) on Brilliant using the link https://brilliant.org/sabine. You can get started for free, and the first 200 will get 20% off the annual premium subscription. Take the quiz to see if you understood everything: https://quizwithit.com/start_thequiz/1687737623494x575496266320185500 If you've been following my channel for a really long time, you might remember that some years ago I made a video about whether faster-than-light travel is possible. I was trying to explain why the arguments saying it's impossible are inconclusive and we shouldn't throw out the possibility too quickly, but I'm afraid I didn't make my case very well. This video is a second attempt. Hopefully this time it'll come across more clearly! 💌 Support us on Donatebox ➜ https://donorbox.org/swtg 👉 Transcript and References on Patreon ➜ https://www.patreon.com/Sabine 📩 Sign up for my weekly science newsletter. It's free! ➜ https://sabinehossenfelder.com/newsletter/ 🔗 Join this channel to get access to perks ➜ null 00:00 Intro 01:51 The Speed of Light as Limit 06:12 The Speed of Light as Barrier 12:44 Time Travel Paradoxes 20:47 Quantum Gravity and Summary 21:54 Learn Physics on Brilliant #science #physics