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Data from studies in middle-and high-income countries analyzed by WHO indicate that among teenagers and young adults aged between 12 and 35, nearly 50 percent were exposed to unsafe levels of sound from personal audio devices and around 40 percent were exposed to potentially damaging levels of sound at entertainment venues.

Deepak Bhatia, a state government administrator, said the cause of the explosion was being investigated.

Data from Shenzhen-based Qianzhan Industry Research Institute predicts that China's face recognition market size is expected to keep a growth rate of more than 20 percent in the next five years and will reach 10 billion yuan (.45 billion) by 2024.

Dave Limp of Amazon devices and services announces that actor Samuel L. Jackson will be the first celebrity voice for Alexa. (GeekWire Photo / Kurt Schlosser)

Dai Bin, president of the China Tourism Academy, said Yanqing district will play host to both the exhibition and the 2022 Winter Olympics, which will provide perfect opportunities to develop the local comprehensive tourism.