PolyU PolyU research reveals significant effects of instructors onscreen during video classes in aiding student learning 07.08.2025 - 18:07:20 The Hong Kong Polytechnic University Hong Kong View original content:https://www.prnewswire.co.uk/news-releases/polyu-research-reveals-significant-effects-of-instructors-onscreen-during-video-classes-in-aiding-student-learning-302098031.html