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Citizens of China and Armenia can enjoy 90-day visa-free arrival in the other country starting from Jan 19 next year, according to the Chinese embassy in Armenia on Monday, Xinhua reported.

Chris Anderson, from central Pennsylvania told The New York Times that he and a friend drove around Ohio buying about 10,000 facemasks from shops. He bought packs of 10 masks for each and resold them for to . He estimated that he made a ,000 profit.

Chinese stocks closed lower on Tuesday, with the benchmark Shanghai Composite Index down 0.88 percent at 2,504.82. The smaller Shenzhen Component Index closed 0.81 percent lower at 7,332.35.

Circadian rhythms adapt the workings of the body to different phases of the day, influencing sleep, behavior, hormone levels, body temperature and metabolism.

Cities and states across the United States are enlisting thousands of people to run contact-tracing programs to track COVID-19 cases to prevent a resurgence of the disease and reopen their economies.