Shark Guards Can Repel Sharks and Stingrays

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A device called shark guard generates a strong electrical pulse every two seconds. When there's a strong enough field, the sharks are overstimulated and repelled rather than attracted. Scientists conducted a pilot study to test how well these worked off of the coast of France. The hooks that had shark guards on them caught 91% fewer shark and 71% fewer stingrays than those without it.

With astonishing speed, the machinery of testing, tracing and lockdowns is being dismantled. We examine the risks that will pose to a country that is not prepared for big outbreaks. A winemaker’s lawsuit in Napa Valley reveals why many Californians believe regulators are unfriendly to business. And a clever solution to spare sharks from becoming unwanted “bycatch”. Help us make the show better: take our listener survey at http://economist.com/intelligencesurvey For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer