Lessons from the little Hero of Haarlem

Many years ago, so the old fable goes, there was a small boy who lived with his family in Haarlem in the Netherlands. As is well known, much of that country is below sea-level, and huge dykes have been built to hold out the water.

One rainy evening, the boy was trudging along a dyke on his way home, when he noticed that due to the rough seas and heavy