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Janna Levin is a theoretical physicist and cosmologist specializing in black holes, cosmology of extra dimensions, topology of the universe, and gravitational waves.
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*Transcript:*
https://lexfridman.com/janna-levin-transcript

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Janna's X: https://x.com/JannaLevin
Janna's Website: https://jannalevin.com
Janna's Instagram: https://instagram.com/jannalevin
Janna's Substack: https://substack.com/@jannalevin
Black Hole Survival Guide (book): https://amzn.to/3YkJzT5
Black Hole Blues (book): https://amzn.to/42Nw7IE
How the Universe Got Its Spots (book): https://amzn.to/4m5De8k
A Madman Dreams of Turing Machines (book): https://amzn.to/3GGakvd

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*OUTLINE:*
0:00 - Episode highlight
2:03 - Introduction
3:03 - Black holes
10:37 - Formation of black holes
21:28 - Oppenheimer and the Atomic Bomb
27:50 - Inside the black hole
40:53 - Supermassive black holes
44:22 - Physics of spacetime
47:25 - General relativity
52:56 - Gravity
1:09:29 - Information paradox
1:17:59 - Fuzzballs & soft hair
1:21:10 - ER = EPR
1:27:49 - Firewall
1:36:41 - Extra dimensions
1:39:06 - Aliens
1:54:42 - Wormholes
2:05:40 - Dark matter and dark energy
2:15:43 - Gravitational waves
2:27:51 - Alan Turing and Kurt Godel
2:40:05 - Grigori Perelman, Andrew Wiles, and Terence Tao
2:46:40 - Art and science
2:56:19 - The biggest mystery

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Destiny 2: I Confini del Destino // 15 luglio 2025. 

Rivedi l'evento di presentazione di Destiny 2 L'Anno della Profezia, con tanto di anteprima sulle espansioni I Confini del Destino e I Ribelli, in arrivo su Destiny 2 questo stesso anno.  

Preacquista Destiny 2: L'Anno della Profezia Ultimate Edition per sbloccare subito Qualcosa Oltre il Nulla e i decori per armatura Leggende del Lato Oscuro.  

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Destiny 2 : Les Confins du Destin // 15 juillet 2025 

Rattrapez ce que vous avez manqué de l'événement de révélation pour l'Année de la Prophétie de Destiny 2, avec les aperçus des extensions Les Confins du Destin et Rebelles, à venir dans Destiny 2 cette année.  

Précommandez l'Édition Ultimate de Destiny 2 : Année de la Prophétie pour déverrouiller instantanément Neo Finis Terræ et les ornements d'armure de Légendes du côté obscur.  

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Plongez dans l'univers de Destiny 2 et jouez gratuitement pour découvrir les combats réactifs de ce jeu de tir à la première personne, pour explorer les mystères de notre système solaire, et déchaîner vos capacités élémentaires contre de puissants ennemis. Créez votre Gardien, récupérez des armes, armures et équipements uniques, et personnalisez votre look et votre style de jeu. Découvrez l'histoire et les cinématiques de Destiny 2 en solo ou avec vos amis, rejoignez d'autres Gardiens pour des missions en coopération corsées, ou affrontez-les dans toute une variété de modes en JcJ.

Massive battles are ongoing across the Indian/ Paksitani border as both sides wage total war gainst the other, preparing major offensives and large airstrikes as battles rage in the mountains below. It has been confirmed that at a minimum India has lost 3 aircraft in the first opening hour of the war, with the loss of the Pkaistani JF-17 still unconfirmed. Pakistan has vowed that they will avenge the slain of Operation Sindoor while India has pledged that Operation Sindoor is far from over. In Russia, Moscow has been udner heavy drone attacks today as foreign leaders arrive for the May 9th Parade. Russia has diverted all flights to other airports and closed all airports around Moscow as a result. Ukrainian armed forces have encircled the small city of Tetkino in the Russian Kursk Oblast, while offensive efforts further east have run into major issues. The US is now changing it's stance on Russia as it claims that Putin, not Zelensky, is the real roadblock to peace.

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《天命2》：命運邊緣 // 2025年7月16日

回顧《天命2》預言之年的揭示活動，搶先預覽今年即將推出的《命運邊緣》和《反叛浪潮》資料片！

預購《天命2》：預言之年終極版就可以立即解鎖遙遠新國度和暗面傳說防具裝飾品。

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深入可免費遊玩的《天命2》遊戲世界，盡情體驗充滿回饋感的第一人稱射擊戰鬥，探索我們太陽系中的奧秘，並釋放元素技能對抗強大的敵人。創造自己的守護者並收集獨一無二的武器、防具和裝備，自訂你的外觀和遊戲風格。你可獨自一人或與朋友一起體驗《天命2》電影般的劇情，加入其他守護者的行列，一起執行充滿挑戰性的合作任務，或是在各種PvP模式下與朋友對戰。

Today, Pakistan is firing drones and missiles at multiple Indian cities including primarily the city of Jammu in the Kashmir Region. This attack comes after India attacked the Pakistani city of Lahore last night and reportedly struck Pakistan's Naval College near the old Walton Airfield. Pakistan says the conflict is heading down a "blind alley" and escalation seems to be the only way forward. Meanwhile the U.S. Consulate in the Pakistani city of Lahore has ordered personnel to shelter-in-place due to recent attacks on the city by Indian forces. There are also eyewitness reports that Pakistan has struck the Indian airport in Jammu and major explosions have been reported in the area. Pakistan has also declared an emergency in the capital city of Islamabad as air raid sirens are being heard in the city for some unknown reason. We have major news today - so please like and subscribe for more daily war updates.

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命运2：宿命边缘 // 2025年7月16日

关注《命运2》预言之年的揭晓活动，包括今年晚些时候即将在《命运2》中推出的《宿命边缘》和《反叛》扩展预览。

预购《命运2：预言之年》终极版，立即解锁彼岸新域和黑暗面传奇护甲皮肤。

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进入《命运2》的免费游戏世界来体验第一人称射击战斗，探索我们太阳系的隐秘并向你的强大的敌人们释放元素的怒火。创建你的守护者，收集独特的武器、护甲和道具来个性化你的外观和游戏风格。独自或与其他朋友一起体验《命运2》的剧情故事，加入其他守护者一起进行合作任务，或与其他守护者在PvP模式中进行竞争。

IShowSpeed Tries Chinese Dumplings

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Massive strikes have been conducted by India and Pakistan over the past 24 hours, hitting major cities and military targets through the night. Indian naval forces have now issued NOTAMS near to Pakistani waters for "Live fire exercises" which may result in direct action by the Indian navy on Pakistan. Both sides have signalled full interest in escalating the conflict form here. Ukrainian forces have captured the city of Tetkino, a small city several miles in Russia inside of the Kursk Oblast. Russian forces have been unable to uproot or drive the Ukrainian forces out, showing that they will have to divert a larger number of forces into the area. US policy is rapidly shifting on Russia, as the US is becoming far more friendly with Ukraine and much more hostile against Russia.

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Destiny 2: The Edge of Fate // July 15, 2025. 

Catch up on the Reveal Event for Destiny 2’s Year of Prophecy, including previews of The Edge of Fate and Renegades expansions coming to Destiny 2 later this year.  

Pre-purchase Destiny 2: Year of Prophecy Ultimate Edition to instantly unlock New Land Beyond and the Dark Side Legends Armor Ornaments.  

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Dive into the free-to-play world of Destiny 2 to experience responsive first-person shooter combat, explore the mysteries of our solar system, and unleash elemental abilities against powerful enemies. Create your Guardian and collect unique weapons, armor, and gear to customize your look and playstyle. Experience Destiny 2’s cinematic story alone or with friends, join other Guardians for challenging co-op missions, or compete against them in a variety of PvP modes.