Students participate in a game called "Global Threat" during the Week of Science and Technology event in Prague, the Czech Republic, Nov. 12, 2019. The Czech Academy of Sciences hosts the Week of Science and Technology in Prague from Nov. 11 to 17. The festival aims to attract public, especially young students, to pay more attention to the global threats such as climate change and natural disasters. (Photo by Dana Kesnerova/Xinhua)