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"Every time I express my belief that sex education should begin at primary school level, many of my friends are stunned, almost open mouthed. They say 'Oh, my goodness! How can we allow these innocent kids to learn about sex?'" said Li Ming, a sex education teacher at Xingzhi Primary School in the Beijing's Daxing district.

"Exploring the Red Planet with NASA's Mars Helicopter exemplifies a successful marriage of science and technology innovation and is a unique opportunity to advance Mars exploration for the future," said Thomas Zurbuchen, associate administrator for NASA's Science Mission Directorate at the agency headquarters here.

"Deeply saddened by the destruction we saw last night in Center City. In looting downtown, these individuals not only desecrated private businesses, they also desecrated the important message that was heard in the earlier, peaceful protests," Mayor Jim Kenney said on Twitter on Sunday.

"Due to life's stresses, sometimes they will actively look for the chance to escape from social interaction to enjoy solitude. As a result, dining, traveling and singing karaoke or watching movies alone has become more common," she said.

"Drug developers spend a lot on research, so intellectual property rights in the industry should be strongly protected, particularly as sustained innovation will help us continue to obtain safe medicines and fight diseases."