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The facts on COVID-19 contact tracing apps, and benefits of returning sea otters to the wild

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ins and outs of coronavirus contact tracing apps—what they do, how they work, and how to calculate whether they are crushing the curve.Read all our coronavirus coverage.Edward Gregr, a postdoctoral fellow at the Institute for Resources, Environment, and Sustainability at the University of British Columbia, Vancouver, talks with Sarah about the controversial reintroduction of sea otters to the Northern Pacific Ocean—their home for centuries, before the fur trade nearly wiped out the apex predator in the late 1800s.

Gregr brings a unique cost-benefit perspective to his analysis, and finds many trade-offs with economic implications for fisheries For example, sea otters eat shellfish like urchins and crabs, depressing the shellfishing industry;.

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