The tiger shark tank was forty feet long and fourteen feet high. The water was a striking blue with red coral, green algae plants, and codium. The viewing area in front of the tank was sublevel with pot lights, which offered dull illumination. Its floor was cement, and two wooden benches hung against one of the walls, opposite the tank, where middle-aged and old spectators could sit and relax while watching the underwater world. I studied six tiger sharks in motion: propelling from side to side by the use of their long tails. Could I swim in the tank with the beasts? How much more dangerous could they really be compared to dating professional football players? I felt pretty sure the species was quite protective of its watery space, but so was a linebacker on a field during an intense cham

