As soon as I saw Euan's photo I knew that was coming.
Rob, you would have to agree that all the extra stuff on the planet is at the "top" (stuff like war surplus vehicles, most of the continents, highest mountains, most of the people etc. Agree?
The next thing you'd have to agree with, is that if you put a weighted floating ball in water, the heavy bit goes to the bottom. Agree?
Who says you guys are at the top? I reckon some northern hemisphere dude wrote the book.