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"Five years after the first Global Teacher Status Index in 2013, we can see, once again, China has come top, demonstrating just how much respect the Chinese public has for teachers," said Vikas Pota, chairman of the Varkey Foundation. "This is crucial because, as the Global Teacher Status Index 2018 shows for the very first time, there is a direct link between teacher status and pupil performance as measured by PISA."

"From its home in China, the Annual Meeting of the New Champions has grown over 12 years to become the leading global event bringing leaders from government and business together with those from science and technology. I'm proud this year to be welcoming so many Chinese and international partners, many for the first time, as we look to find new ways for innovation to address our gravest challenges and to drive human and economic development," said David Aikman, chief representative officer for China at World Economic Forum.

"Governments used to rely on whistleblowers for clues, but with the help of big data they can take the initiative on more cases," he said.

"For the first time we have detected a potential toxin of concern," Anne Schuchat, principal deputy director at the CDC, said Friday in a conference call with reporters.

"Given the increasingly converging China-US interests and the close-knit pattern of the two countries being mutually dependent, there will be no future or winner but only losers in a trade war," she warned.