Check out Robert's book "Faster Than Light" ➜ https://www.amazon.com/Faster-than-Light-Your-Shadow/dp/1662933843/ Kindle: https://www.amazon.com/Faster-than-Light-Your-Shadow-ebook/dp/B0CHPZH49K/ What does physics say about time travel? Surprisingly enough it doesn't just say it's impossible, it's more complicated than that. In this video I'll sort out what Einstein's general relativity and quantum mechanics tell us about time travel. And is MIT really building a time machine to find dark matter? We'll get to that. This video has a quiz which you can take here: https://quizwithit.com/start_thequiz/1697148954345x743164650631523500 💌 Support us on Donatebox ➜ https://donorbox.org/swtg 🤓 Transcripts and written news on Substack ➜ https://sciencewtg.substack.com/ 👉 Transcript with links to references on Patreon ➜ https://www.patreon.com/Sabine 📩 Sign up for my weekly science newsletter. It's free! ➜ https://sabinehossenfelder.com/newsletter/ 👂 Now also on Spotify ➜ https://open.spotify.com/show/0MkNfXlKnMPEUMEeKQYmYC 🔗 Join this channel to get access to perks ➜ https://www.youtube.com/channel/UC1yNl2E66ZzKApQdRuTQ4tw/join 🖼️ On instagram ➜ https://www.instagram.com/sciencewtg/ 00:00 Intro 00:20 What do we mean by time travel? 02:51 Special Relativity 04:33 General Relativity 10:07 Time travel paradoxes 12:28 Time-reversal 16:10 New book "Faster than Light" #science #physics