"Bert is certain he can ride his bike as well as Frank, but he is very wobbly! And even when they both try riding Frank's bike it still goes very wrong! Will the best friends make it all the way down from the big hill? Of course! All they need is a little bit of confidence and trust in each other!"--Publisher's description.

"These days the bicycle often appears as an interloper in a world constructed for cars. An almost miraculous 19th-century contraption, the bicycle promises to transform our lives and the world we live in, yet its time seems always yet-to-come or long-gone-by. Jonathan Maskit takes us on an interdisciplinary ride to see what makes the bicycle a magical machine that could yet make the world a safer, greener, and more just place."--