A girl observes a light-driven toy at the Science Fair in Prague, the Czech Republic, June 7, 2019. The Science Fair, organized annually by the Academy of Sciences of the Czech Republic, brought over 100 exhibitors, mainly scientists from the Academy of Sciences of the Czech Republic, universities and innovative companies. (Xinhua/Dana Kesnerova)
Science Fair held in Prague, Czech Republic
Source: Xinhua| 2019-06-08 18:53:55|Editor: Shi Yinglun
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