Michio Kaku: Future of Humans, Aliens, Space Travel & Physics | Lex Fridman Podcast #45

In this wide-ranging conversation with Lex Fridman, Michio Kaku argues that contact with extraterrestrial civilizations is statistically near-inevitable and frames advanced beings on the Kardashev scale, extending it to type 4 (dark energy) and type 5 (the multiverse). He explains string theory as the leading unifying theory, describing the universe as a 'symphony of strings,' and explores the multiverse as a way to reconcile Buddhist and Christian views of creation. Kaku predicts brain-machine interfaces, memory chips, 'brain net,' and the digitization of human personality leading to digital immortality, possibly beamed across space by laser. He also discusses genetic immortality via fixing aging errors with CRISPR, why he doubts the universe is a simulation, and the path to a type 1 civilization. He closes on near-term space goals: humans on Mars in the 2030s, fusion power, and terraforming Mars by melting its polar ice caps.

• Kaku predicts we may pick up signals from an extraterrestrial civilization within this century.
  00:01:02
• A little boy at a London planetarium prompted Kaku to add a type 4 civilization to the Kardashev scale, powered by dark energy.
  00:04:40
• As a quantum physicist he argues the Big Bang happened many times, making the multiverse a type 5 energy source.
  00:06:14
• He claims the future of the internet is 'brain net' transmitting emotions and telepathic communication.
  00:23:27
• Kaku predicts digital immortality by digitizing the human brain, then beaming it across space by laser into avatars.
  00:30:12
• Going outside the laws of physics, he speculates a 'laser highway' of billions of alien souls may already exist near Earth.
  00:32:19
• He reveals a newspaper photo of Einstein's unfinished manuscript at age 8 set him on his life's path.
  00:43:48
• He argues the universe cannot be a simulation because no finite Turing machine can simulate it and humans aren't worth simulating.
  00:50:39

• On average every star in the Milky Way has a planet, and about one-fifth have Earth-sized planets.
  00:01:35
• Dark energy is 73% of the universe, dark matter ~23%, and ordinary matter only ~4%.
  00:05:12
• Oppenheimer was so frustrated by new particles he joked the Nobel should go to the physicist who does NOT discover one.
  00:10:25
• Galileo said science determines how the heavens go, while religion determines how to go to heaven.
  00:13:00
• Kaku names three roots of intelligence: stereo eyesight, an opposable thumb/claw, and language to pass on knowledge.
  00:18:13
• Aging is simply the build-up of genetic errors, concentrated in the cell's mitochondria where 'combustion' happens.
  00:35:22
• Kaku calls junior high school 'the greatest destroyer of scientists known to science.'
  00:40:39
• He says science is about principles and physical pictures, not memorizing names of birds or dinosaurs.
  00:42:16
• A fission reactor produces ~30 tons of nuclear waste per year, while a fusion reactor's waste is valuable helium gas.
  00:55:24
• Kaku notes the dinosaurs had no space program, which is why they are not here today.
  00:58:30

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