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"Getting married later is a common phenomenon in the world. China is no exception with rising age at first marriage," said Zhang Juwei, a demographer with the Chinese Academy of Social Sciences.

"For instance, when we try to create certain content or determine where a plot should be heading, we rely on feedback from our target users that is recommended by algorithms powering our WeChat or QQ (social media) platforms," he said.

"Grandfather often told us that it was the protection offered by the Kazakh man that allowed us to survive in this land," said Li, 65, who also helped to raise several orphaned Kazakh boys in the area.

"Further research may greatly assist the study of the ancestry of modern human beings not only in China, but also in the rest of East Asia, Southeast Asia and even for Native Americans," Chen said.

"First, they need a scapegoat for the disastrous impact that the coronavirus pandemic is having on the lives and economic welfare of Americans, and to divert attention away from their own failings," he said.