REGIONAL SCIENCE AND TECHNOLOGY FAIR (RSTF) FOR 2020-2021: “SIYENSIKULA” Posted on August 11, 2021 by DepEd Mandaluyong Leave a comment 21-08-31. REGIONAL SCIENCE AND TECHNOLOGY FAIR (RSTF) FOR 2020-2021: “SIYENSIKULA” Memorandum Unnumbered