Nearly ten million people download Germany's new coronavirus tracking app in just three days. There's still a ways to go: Scientists want 60% of the public to use the app. And the government says buy-in is critical. "The app can help to warn contacts of infected persons faster than was previously possible. And every hour of early warning of a threat of infection is a gain in fighting this virus." But as governments around the world track the virus - can we be sure they aren't also tracking citizens?

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