Sharks and Rays Physiology Explained

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Sharks and their close relatives, the rays, are at particular risk of getting caught on long line fishing lines. Scientists have found that the populations of sharks and rays have declined by around 70% in the last 50 years. But using a unique quirk of sharks and ray physiology, scientists have found a possible solution.

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