These essays are on topics reflecting the intersection of science and humankind. They concern time, consciousness, beauty, probability, and understanding. They supplement and compliment my book Important Things We Don't Know: About Nearly Everything and are presented here as an accompaniment to that book.

But, this volume can stand on its own.

For several years, I periodically updated Important Things. But, I decided to leave the last edition as the last. Nonetheless, I keep reading and thinking. So, I have been writing short essays on scientific subjects and including them in my Wanderings books. There are now enough that I thought it worth making them (updated and revised-in some cases, very substantially), along with some new ones, separately available as an addendum to the original book.

This is the second edition, revised and updated.