I don't remember much about school. Just a tidbit here and there. But, I have always remembered this teacher who showed us a picture he had taken on his vacation. I can't remember where it was, somewhere tropical. It was just clear water with a blue hue to it and there was this fish about the size of a guppy. He asked the class what kind of fish we thought it was. I told him that it looked like a guppy. He said they caught that fish about 10 minutes later. It was a 15 foot tiger shark. Clear water can be very deceiving.