[In his presentation,] Geoff [gives] us the rundown on Venus and what planned missions to Venus are going to look like, or may look like if they're approved. Then he suddenly reminds us all about Venus's basic properties. It's hot. Crazy hot. The pressure is off the chain. It rains frickin' sulfuric acid! There's no air. Then Geoff says, all that aside, Venus is probably the second most habitable planet in the solar system. Say what? I'm intrigued, as Geoff goes on to explain that if you go high enough up into Venus's atmosphere, the pressure is standard, the heat normal, you're above the sulfuric acid-raining clouds, and then tells us that there, normal breathable Earth air is a lifting gas. So if you were to, say, enclose a mile-wide structure in a bubble, and fill that with normal breathable air, it would float. In other words, you get a scientific justification for Cloud City. As long as it's a giant floating marble.