(15:25). This was, of course, what the people themselves should have done in their difficult situation. Moses was given a speedy response to his prayer. The LORD showed him a piece of wood. ‘Showed’ is more literally ‘taught’ or ‘instructed’. This may mean that this particular tree possessed properties that would assist in removing the bitterness from the waters. Such trees do exist. Modern research has told us about the moringa tree whose crushed seeds provide an environmentally friendly and inexpensive