Book excerpt: The human mind is extraordinary, with capabilities far beyond that of other living creatures. But is it capable of comprehending all that is? In this entertaining yet thoughtful look at the human experience, Dr. E. Andrew Boyd examines human cognitive limitations by exploring enigmatic results spanning the disciplines of math, physics, philosophy, neuroscience, and computer science.Each chapter is designed to leave readers asking "What on earth?" as they discover new and wonderful things about our world, and in the process develop a new appreciation of what it means to be human.