• A huge portion of the episode was dedicated to UFO and aliens. 100% agree with Michio Kaku that aliens exist (probability is too big). Also it’s very nice that credible scientists explore the possibility of sighting, investigate the existing evidence and so on.
• 3 types of civilizations.
• There was a mention of a speculation (hypothesis) that a type-2 civilization was found: a star dimmed 20%, and the speculation that there’s a dyson sphere circling around it.
• Interesting things about animals. For example, ants exchange certain chemicals and those can create around 100 words, which is enough to create ants society. IIUC, such modeling was done successfully.
• Dolphin’s language is still not cracked :(
• Beautiful explanation of a string theory.