Why You Shouldn't Jump Off the Ifel Tower

The chapter is about this idea that there are these two people on the top of the ifal tower, david and the crypno andoctavus. They're having this debate about why one shouldn't jump off the ifel tower. After all, if you can't justify as true the theory that if you do jump off, you're going to hit the ground, a general relat or newtonian gravity, or whatever else that allows you to make that prediction,. If you're not justified in thinking it's true, then there's no reason not to jump off  and just think you'll float to the ground.