China's second female astronaut, Wang Yaping, has delivered the country's first-ever video lecture from space. Speaking to students via live video, Ms Wang used spinning tops, a ball, water and a fellow astronaut to explain physics in zero-gravity. via Pocket http://www.bbc.co.uk/news/world-asia-china-22981839#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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