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At a time when the international community should be more united than ever, Trump is pulling the US out of the WHO, said Villacorta, who described the move as a grave error.

Asked how he could fit astronaut training around his already hectic schedule, he said he adhered to his own company policy of working a six-hour day and devoting the rest of the time to personal projects.

Associate Professor Lydia Bourouiba has studied the dynamics of coughs and sneezes at MIT's Fluid Dynamics of Disease Transmission Lab and found that exhalations can create clouds that travel as much as 27 feet.

Assuming that there is no big resurgence of COVID-19 cases and China-United States relations stay largely unchanged, economists forecast that China's economic recovery will continue to be on a firm footing and growth could further rebound to around 7 percent next year.

Asked about whether the cancelled visit of US Secretary of State Mike Pompeo to the DPRK influenced the opening date of the liaison office, the spokesman said there was a virtuous cycle between the inter-Korean relations and the DPRK-US relations.