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" ... As a student of medicine at Edinburgh University, Darwin frequented various courses on natural sciences, including lectures by mineralogist Robert Jameson. "During my second year at Edinburgh I attended Jameson's lectures on Geology and Zoology, but they were incredibly dull. The sole effect they produced on me was the determination never as long as I lived to read a book on Geology, or in any way to study the science." ... "
" ... At the time of the event, international newspapers speculated about a volcanic eruption. Russian scientists, like Dr. Arkady Voznesensky, Director of the Magnetographic and Meteorological Observatory at Irkutsk, speculated about a cosmic impact. In 1927, Russian mineralogist Leonid Alexejewitsch Kulik of the Russian Meteorological Institute, explained the event as the mid-air explosion of a meteorite, based on the lack of an impact crater on the ground and the discovery of interplanetary dust in peat layers at the site. In 1934, Soviet astronomers, based on Kulik's work, proposed that a comet exploded in Tunguska. Such an icy body, entering the atmosphere, would rapidly heat up and evaporate explosively in mid-air without ever hitting the ground. The resulting explosions could have been powerful enough to flatten trees without leaving a crater or much other evidence. ... "
" ... In 1921, Russian mineralogist Leonid Alexejewitsch Kulik of the Russian Meteorological Institute became interested in the story after reading a newspaper article, claiming that passengers of the Trans-Siberian Railway observed an impact, even touching the still hot meteorite. Kulik organized an expedition and traveled to the city of Kansk, where he studied reports about the event in the local archives. The story of the train passengers was clearly a hoax. However, Kulik managed to find some articles, describing an explosion observed north of Kansk. From the remote outpost of Wanawara, the team ventured into the taiga following first the Angara river and then the Tunguska river. Then on April 13, 1927, Kulik discovered a large area covered with rotting logs. A huge explosion flattened more than 80 million trees across 820 square miles. Only at the epicenter of the blast, in the Forest of Tunguska, some dead and charred trees were still standing. ... "