A strong DNF, I would be kind and give it two stars since the idea of having an intrinsic motivation is a nice idea, but the examples he gives are so wildly selective and innaccurate I can't forgive it.

He also includes a concept that was so dumb it might have melted my brain. He claims people in the past believed the world was flat so they didn't explore because they were scared of falling off the edge.

That's why they didn't explore.

Not because of a lack of sufficient naval technology. Not because of societies needing to reach a certain size to have the ability to fund and man risky exploratory missions. No.

The reason sailors didn't explore was because they were scared of falling off the edge of the map.

I can't.