After repeatedly failing to find a room on the campus of Carnegie Mellon that is silent enough to record our podcast in, we asked ourselves this question. Because every little sound messing up our pristine recording—the spinning of computer fans, the constancy of indoor climate control, the buzz...

This week, we're traveling halfway around the globe using the most direct route we can think of-- through the center of the Earth. To help us along the way, we consult the mind of Professor Markus Deserno of the department of Physics at Carnegie Mellon. It turns out, even after turning down the...