— -- In Crayon Physics, scribbles and doodles wriggle into existence. Lines become lifelines. Right angles become brackets, braces, even fulcrums. Circles trundle down slopes or link wagging ...

How often do you finish a book and sit there and just smile? Sitting in my office alone, without the benefit of a toddler to read this to, I probably should feel dopey that I am this elated over a ...