"The Effectiveness of a Blended Learning-Based Training Program in Teaching Physics for Developing 21st-Century Skills Among Second-Grade Secondary Students in the Capital Secretariat - Sana’a": . jhs [Internet]. 2026 Feb. 28 [cited 2026 Apr. 15];5(2):335-53. Available from: https://journals.su.edu.ye/index.php/jhs/article/view/2105