This short book is an invitation to think about a number of important issues in new ways. It is intended both for those encountering these topics for the first time and for experienced researchers. I hope that both groups—and everyone in between—will benefit from these essays.

They can be read in any order, and no chapter depends on another. The reader can “browse” the book without needing to read it from start to finish. Think of it as a collection of healthy, delicious snacks for the mind. Enjoy it.