sentences:  As a boy he wrote poetry and was interested secular subjects; when he was 15 years old, he and Brenner together produced a literary journal that they distributed to a small circle of friends.Around 1899, when Gnessin was 18 years old, he was invited by Nahum Sokolow to join the editorial board of the Hebrew-language newspaper "Ha-Tsefirah", in Warsaw, where he began to publish his poems and stories, as well as literary criticism and translations.His first book, "Zilelei ha-Hayyim" (The Shadows of Life), a collection of stories and sketches, was published in 1904.