black hole

How much salt is too much salt?

Most likely, the amount you're consuming.

A new study published this week in the journal JAMA found that cutting one teaspoon of salt a day results in a decline in blood pressure comparable to taking medication. Plus, other science news from this week, like the oldest confirmed black hole and how climate change and pollution are causing a big imbalance in the sexes of turtles.

Got other science news for us to consider? Email us at shortwave@npr.org.

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Andrew Strominger is a theoretical physicist at Harvard. Please support this podcast by checking out our sponsors: - Eight Sleep: https://www.eightsleep.com/lex to get special savings - Rocket Money: https://rocketmoney.com/lex - Indeed: https://indeed.com/lex to get $75 credit - ExpressVPN: https://expressvpn.com/lexpod to get 3 months free EPISODE LINKS: Andrew's website: https://www.physics.harvard.edu/people/facpages/strominger Andrew's papers: Soft Hair on Black Holes: https://arxiv.org/abs/1601.00921 Photon Rings Around Warped Black Holes: https://arxiv.org/abs/2211.01674 PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (06:34) - Black holes (11:37) - Albert Einstein (31:05) - Quantum gravity (35:17) - String theory (46:05) - Holographic principle (54:02) - De Sitter space (59:14) - Speed of light (1:06:02) - Black hole information paradox (1:13:41) - Soft particles (1:22:48) - Physics vs mathematics (1:31:58) - Theory of everything (1:47:20) - Time (1:49:45) - Photon rings (2:05:26) - Thought experiments (2:13:47) - Aliens (2:19:25) - Nuclear weapons

Lord Martin Rees is a cosmologist and astrophysicist at Cambridge University and co-founder of the Centre for the Study of Existential Risk. Please support this podcast by checking out our sponsors: - Lambda: https://lambdalabs.com/lex - InsideTracker: https://insidetracker.com/lex to get 20% off - Indeed: https://indeed.com/lex to get $75 credit - ExpressVPN: https://expressvpn.com/lexpod and use code LexPod to get 3 months free - Onnit: https://lexfridman.com/onnit to get up to 10% off EPISODE LINKS: Martin's Twitter: https://twitter.com/lordmartinrees Martin's Website: https://www.martinrees.uk Martin's Books: If Science is to Save Us: https://amzn.to/3yXRqsc The End of Astronauts: https://amzn.to/3B604ro On the Future: https://amzn.to/3OlzLjB PODCAST INFO: Podcast website: https://lexfridman.com/podcast Apple Podcasts: https://apple.co/2lwqZIr Spotify: https://spoti.fi/2nEwCF8 RSS: https://lexfridman.com/feed/podcast/ YouTube Full Episodes: https://youtube.com/lexfridman YouTube Clips: https://youtube.com/lexclips SUPPORT & CONNECT: - Check out the sponsors above, it's the best way to support this podcast - Support on Patreon: https://www.patreon.com/lexfridman - Twitter: https://twitter.com/lexfridman - Instagram: https://www.instagram.com/lexfridman - LinkedIn: https://www.linkedin.com/in/lexfridman - Facebook: https://www.facebook.com/lexfridman - Medium: https://medium.com/@lexfridman OUTLINE: Here's the timestamps for the episode. On some podcast players you should be able to click the timestamp to jump to that time. (00:00) - Introduction (06:39) - Understanding the universe (15:09) - Human limitations and AI (24:05) - Dark matter (31:25) - Vast universe (39:07) - Alien life (52:59) - Space exploration (1:17:22) - Future technology (1:28:44) - Newton and Einstein (1:32:46) - Black holes (1:46:27) - Cosmological threats (2:13:31) - Advice for young people (2:16:02) - Mortality