āđ€āļ™āļ·āđˆāļ­āļ‡āđƒāļ™āđ‚āļ­āļāļēāļŠāđ„āļ”āđ‰āļ•āļĩāļžāļīāļĄāļžāđŒāļœāļĨāļ‡āļēāļ™āļ§āļīāļˆāļąāļĒ āļĢāļ°āļ”āļąāļšāļ™āļēāļ™āļēāļŠāļēāļ•āļī āļāļĨāļļāđˆāļĄ Scopus Q4 āļ§āļīāļˆāļąāļĒāđ€āļĢāļ·āđˆāļ­āļ‡ Fostering Elementary Students' Problem-Solving Skills and Scientific Mindset through Engineering Design: Evidence from a Rural STEM Camp in Thailand āļ§āļēāļĢāļŠāļēāļĢ Journal of Science and Mathematics Letters Vol. 14 No. 2 (2026) page 222-235