William Poundstone underscores the right mindset any person can and should develop. The emphasized traits are particularly essential considering our future characterized by continuous technological advancement. A time where key skills will be adaptability and a willingness to keep learning, no matter how much you fall. Since this book has been published, there has been an increasing amount of studies and literature exclaiming the importance of the 'growth mindset.' "Google it," is therefore, an apt and timely suggestion. Aside from the main riddles for which the answers have a dedicated chapter, there are a couple of extra questions in the main text which don't have spoiler warnings; a minor nuisance.

PS If riddles make you feel stupid, that's OK. Your brain is growing, provided that work for it.