Science: Sharks Don't Like It

The seiner Angle and Florence, out of Gloucester, Mass., was about to bag a school of mackerel. The boat towed the net, buoyed and weighted, around the milling fish. Next step was to close the "purse" and haul the mackerel aboard.

Just then a school of hungry sharks, unusually active off New England this year, spotted the netful of fish. They charged toward the seine, prepared to tear it to bits. But suddenly they changed their minds, turned tail and swam away.

The sharks had been deeply offended. A boat had towed two cloth bags full of the Navy's new shark repellent all...

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