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"Feet on the ground, look forward, unlock your knees," Edith Chiang, the instructor of the qigong class, said as she demonstrated the movements.

"Each user in turn would be contributor of the more data to enlarge the data pool of the machine-assisted learning and assessment," he explained. "Bigger data, richer information."

"During this largest online education experiment in human history, many online education companies have played their role. The number of users in Zuoyebang, for instance, hit a new high," she added.

"Essilor and Tencent share the same dedication to improving the current state of vision health in China through public education and innovation," said Arnaud Ribadeau Dumas, president of Essilor Greater China and the Global Instruments Division.

"Everybody will have their eyes on the Russell 2000 because people begin to think small-cap US companies, that aren't subject to the winds of international trade negotiations, is the right place to hide out," said Michael Antonelli, managing director, institutional sales trading at Robert W. Baird in Milwaukee.