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Amid proliferation of cryptocurrencies and other new forms of store of value, central banks around the world have been cautious so far in developing a digital currency of their own. They have been sticking to their traditional mandates to use monetary policy to foster employment, ensure price stability, and prevent financial risks.

Among the seven deep tech categories studied by the report, artificial intelligence took the lead in breeding the largest number of unicorns, privately held startup companies valued at over billion, in China. The number was 12 last year, followed by eight deep tech unicorns in the field of biotechnology and three in the field of blockchain.

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Among the nine runners-up of this year's Breakthroughs is the discovery of the 160,000-year-old fossil of a Denisovan jaw in the Qinghai-Tibet Plateau in China. More than 34,000 Science magazine readers picked up the work done by Chinese and German scientists as the top breakthrough of 2019 for People's Choice.

Americans will celebrate their newest giant panda cub by formally giving him a name on Monday, but they face a somber reality: The loan agreement of the newborn's parents, the bears who came to the National Zoo 20 years ago, will expire on Dec 7.