Waves are a ubiquitous and important feature of the physical world, and throughout history it has been a major challenge to understand them. They can propagate on the surfaces of solids and of fluids; chemical waves control the beating of your heart; traffic jams move in waves down lanes crowded wit[...]

Riley gets upset when his playmates pick him last for their games. When Grandpa hears about the problem, he asks, "Riley, have you ever heard about the donkey who carried a king?" Davey was a young donkey who was bored and unhappy because he was never given anything to do. Then one day, some strang[...]

The reign of Charles I, defined by religious conflict, a titanic power struggle with Parliament - culminating in the English Civil Wars, the execution of the king and the brief abolition of the monarchy - was one of the most turbulent in English history. This title presents the dramatic events of th[...]