How round is a rainbow, why does a piece of bread always fall butter side down, and what is blood pressure anyway? The author explains these questions and much more in an engaging, insightful manner. Everyday topics like the functioning of heat pumps and lasers are presented just as compellingly as what causes of black holes, how electric cars change gears, and how much clouds weigh.

Joachim Breckow, University of Giessen, Germany.