This book was a fun read, and make a long flight that much more bearable. I would say that I'm a casual fan of XKCD comics, but find that Munroe has ventured even further into niche humor in recent years. The XKCD comics that I get the biggest laugh out of are always the older ones. But this book has more broad appeal, and I suspect anyone with a passing interest in science or silly thought experiments will get a good kick out of it.