“During the study of marine biological research he put a shark in a large catch tank and released several fish in the tank.
As you might expect, the shark swam quickly around the tank, attacked and ate small fish.
The marine biologist then inserted a solid piece of clear fiberglass into the tank, forming two separate sections. He then placed a shark on one side of the fiber glass and a new fishing net on the other side.
Once again, the shark attacked quickly. This time, however, the shark struck the fiberglass separator and exploded. Undeterred, the shark kept repeating this behavior every few minutes to no avail. Meanwhile, fishing rods were swimming unscathed in the second half. Finally, after about an hour of testing, the shark stopped.
This test was repeated several times over the next few weeks. Each time, the shark became less aggressive and made fewer attempts to attack the fish, until finally the shark got tired of hitting the fiberglass separator and just stopped attacking altogether.
The marine biologist then removed the fiberglass separator, but the shark did not attack. The shark was trained to believe that there was a barrier between them and the fishing rod, so the fishing rods swam wherever they wanted, without injury. ”
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