Science: Two-Way Fish

To Zoology Professor H. W. Lissmann of Cambridge, England, a friend in West Africa sent a small, odd fish with the impressive name Gymnarchus niloticus. It swam forward and backward with equal facility, and it carried a mysterious object m its fingerlike tail. Professor Lissmann put the fish in an aquarium, and admired its skill in avoiding obstacles even when swimming backward. The fish's strange tail, he thought, seemed to be acting like a natural radar.

To test his hunch, Lissmann touched the water with two electrodes connected with an oscillograph. When the two-way fish swam near, a series of regular...

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