The marine biologist then inserted a strong piece of clear fiberglass into the tank, creating two separate partitions. She then put the shark on one side of the fiberglass and a new set of bait fish on the other.
Again, the shark quickly attacked. This time, however, the shark slammed into the fiberglass divider and bounced off. Undeterred, the shark kept repeating this behavior every few minutes to no avail. Meanwhile, the bait fish swam around unharmed in the second partition. Eventually, about an hour into the experiment, the shark gave up.