“Children's Library” is a series of excellent children's books with incredible stories, fairy tales and short stories. The forty-second volume includes two stories by K. Bulychev about the adventures of Alisa Selezneva and her friends. “Ancient Secrets” The first story tells about how the class in which Alice studies begins historical practice, and each student chooses a mystery of the past for himself and tries to unravel it. Arkasha Sapozhkov goes to the Mesozoic era to find out why dinosaurs became extinct. In the distant past, he witnesses a space battle and the death of a starship. The mystery of the disappearance of dinosaurs turns out to be connected with this event. “Pashka the Troglodyte” In the second story, Alice’s best friend Pashka Geraskin chooses the Stone Age for his historical research and, under the guise of an orphan, settles in a troglodyte cave. He tries to teach his fellow tribesmen new knowledge, he himself becomes a great hunter, gets involved in an ancient war and lets his tribe down. He faces the most difficult task - to save himself and unravel the mystery of the disappearance of the Neanderthals.

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