Hayyim Selig Slonimski

Ḥayyim Selig ben Ya'akov Slonimski, also known by his acronym ḤaZaS, was a Hebrew publisher, mathematician, astronomer, inventor, science writer, and rabbi. He was among the first to write books on science for a broad Jewish audience, and was the founder of Ha-Tsfira, the first Hebrew-language newspaper with an emphasis on the sciences.