When we were kids, we used to talk about digging a hole all the way to China. In my teens the movie The China Syndrome came out. The title comes from a hyperbolic story that if a nuclear meltdown occurs, the reactor contents could melt through the Earth all the way to China. This is clearly a fanciful notion because even if it could melt all the way through the Earth, it would only fall down to the center. It would not start falling up to China. But China is the bigger problem. The point on the opposite side of the Earth from where you are standing is called the antipodes. The antipodal point for almost anywhere in North America would be in the Indian Ocean. And since North America is in the Northern hemisphere, our antipode would be in the southern hemisphere, somewhere between the southern tip of Africa and the southern tip of Australia, and there is a lot of open ocean between those two points. Since humans live on land, we tend to be prejudiced toward land. We tend to think...