My friend Don is a wonderful family doctor. But some of the greatest moments of his life have been spent, not in a doctor's office, but on the river - preferably a river with some very challenging white water. He's a veteran kayaker and river rafter - with some fascinating tips for us folks who don't have his experience. He told me that, as a teenager, during his first days on the river, he was amazed to see canoes and kayaks just "hanging out" in the middle of these raging rapids. Then he learned the secret of this amazing feat - there are quiet eddies behind some of the big rocks in the rapids. And those canoeists and kayakers had found a place to rest in very turbulent waters - behind a big rock.