The expert on vulcanoes that talks to the rocks
The rocks are windows to a time long gone, says Valentin Troll, expert on vulcanoes, in the last edition of Universitetsläraren (Swedish magazine; The University Teacher)
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Valentin Troll grew up in Würzburg, northern Bavaria, Germany. One of his earliest memories is accompanying his father to a field of old vulcanic rocks close to the family home. There and then his interest in vulcanoes was awakened, an interest that would lead to his present profession.
Read the article in Universitetsläraren. (In Swedish.)