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I Spent My Summer Using AI To Help Save Greece from COVID-19, writes Jon V. During non-COVID19 summers, the country hosts more than 33 million tourists. This is more than 3 times the population of the entire country. Tourism supports nearly a quarter of the country’s jobs and represents 20% of its GDP. Currently has less than 20 external infections from 100k visitors per day. Of course if Greece wants to keep its borders open while having thousands of tourists per day and restaurants open while keeping low levels of infections low, it will impose stricter controls.