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Наглядная визуализация звуковых волн
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In 2014, Pavel Durov fled the country after allies of the Kremlin took control of the social networking site most know just as VK. Russia's intelligence agency had asked Durov to turn over the data of anti-Kremlin protesters. Durov refused to do so. "The result is on this photo: fiery 'greetings' to the invaders," the Security Service of Ukraine wrote alongside a photo showing several military vehicles among plumes of black smoke. "This time we received the coordinates of enemy vehicles marked 'V' in Kyiv region," it added. Anastasia Vlasova/Getty Images Such instructions could actually endanger people — citizens receive air strike warnings via smartphone alerts.
from cn