Claims of Tunguska Meteorite Fragments "Ridiculous," Scientist Says

Last week, Russian researcher Andrei Zlobin announced that stony fragments collected from a riverbed in 1988 are "probably Tunguska meteorites," and are likely the remains of whatever cosmic object -- thought to be either a comet or an asteroid -- entered Earth's atmosphere over the boggy region of Siberia on June 30, 1908, detonating with