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And it happened "in the blink of an evolutionary eye", which makes it harder to figure out what happened, said Graham Slater, lead author of the study.

And there are signs that the strategy is beginning to pay off.

Analysts say the number of Chinese merchants selling on Amazon's US site began to pick up over the last five years after it introduced measures that allowed sellers worldwide to store products at Amazon's warehouses and provided help in shipping those goods to customers.

An ongoing exhibition at the Overseas Chinese History Museum of China in Beijing unveils how Chinese people at home and abroad joined hands in an effort to contain COVID-19.

Andy Tsang Wai-hung, Hong Kong's former police chief, said the city "urgently" needs a national security law to take on the city's violence, which he said is verging on "terrorism in nature".