F is for FFT

Picked one by one from a mixed channel. Transcript check: both title readers certain; channel sample of 8 certain picks all confirmed by transcript. Channel rule: Include only the narrated explainer videos on computing concepts and history, such as the 'X is for ...' acronym history series, From NUL to DEL (ASCII), The Evolution of Web Apps, the REST, HTTP 402 and Cloudflare explainers, and the 1970s tape recorder video. Exclude all songs and parodies, live performances, interviews, promos, gear comparisons and Advent of Code sessions.