This book is a continuation of one of the most famous popular science sites of all time. Randall Munro - a NASA engineer, scientist, artist and creator of the incredibly popular internet comic xkcd - is trying to find serious answers to the most incredible questions that visitors to his site send him. It turns out that the most serious scientific problems can be talked about easily and with great humor. If you love science, comics, the internet and a good joke - this book is for you.