The black sky suddenly turned momentarily deep blue as if on a bright day - but according to some accounts, the earth moved too. Experts insist the phenomenon was not manmade: there were no reports of missile tests or explosions. Nor were there reports of meteorites striking the earth. Witnesses had the feeling something massive had happened - but what? It was seen and felt by people especially in th three Russian republics - Bashkortostan, Udmurtia, and Tatarstan. 'It lit the night sky from side to side, making it look brighter than daylight,' said one account. Artyom Russkikh said: 'We...