When people of the Stone Age wanted to get from one side of a deep river to the other, what did they do? There were no boats at first, so the only way to do so was to swim across. This problem of rivers was a big one in the Stone Age. Families had to move quite often. They moved to new forests in which the men could find food. They roamed far and wide – it was move, move, and move. When a group of people came to a shallow river, the grown-ups could walk across, carrying the babies and the small children in their arms. But when the river was deep and the current strong it was very difficult for men and women to swim across with the children. So people learnt to make boats. The earliest boats were certainly very simple – perhaps just logs. How was the idea born? Perhaps the idea came to a man who liked to think about an easier and happier time. Such a man, let us suppose, once stood on the bank of a river and saw a tree floating down the river. ‘Oh!’ he cried, ‘it’s