While we stopped for lunch, we argued among ourselves about the best way to cross the rapids. One member of our party was my lifelong soul mate, and she couldn’t swim, so we had to discard the option of placing our knapsacks on our heads and letting ourselves drift to the other bank. But even if she could swim, I doubt we’d have gone ahead with that method. We had no way of knowing what could be submerged beneath these fast-flowing waters. I once heard the story of an able-bodied man trying to swim across some jungle stream only to be impaled through the neck by a piece of wood. I myself had once waded chest-deep through a flash flood, and besides having to fight against the current with all my strength, had to step with both feet on bamboo thorns underwater; by the time I reached the bank, I was in pretty bad shape. Our eyes couldn’t assess the danger of such waters.