This document discusses the importance of capturing non-verbal feedback from learners in e-learning. It provides examples showing that non-verbal cues from as little as 2-10 seconds can accurately predict evaluations of teachers and job interviewers. While live classroom training provides the most non-verbal feedback, e-learning relies more on self-paced and virtual formats. Best practices for capturing non-verbal feedback in e-learning include using aggregate data and not recording videos due to privacy concerns. Emerging technologies are starting to interpret non-verbal cues like facial expressions and engagement levels to help customize adaptive learning paths based on learner confusion or understanding.