Fundamentals of frequency combs: What they are and how they work

Picked one by one from a mixed channel. Transcript check: both title readers certain; 2 of 5 sampled certain picks confirmed by transcript, none failed. Channel rule: Include only full-length (roughly 15+ minute) expert lectures, short-course parts and technical workshop talks that explain a scientific or engineering topic. Exclude Space Challenge team presentations and clips, panel discussions, and short project-profile or promotional videos.