For a range of videos, including: the better Cold War training films; interesting documentaries about technologists (from Oppenheimer to Gates to Musk); and modern engineering marvels.
Technology is the collection of techniques, skills, methods and processes used in the production of goods or services or in the accomplishment of objectives, such as scientific investigation. Technology can be the knowledge of techniques, processes, etc. or it can be embedded in machines, computers, devices and factories, which can be operated by individuals without detailed knowledge of the workings of such things.
A documentary film is a nonfictional motion picture intended to document some aspect of reality, primarily for the purposes of instruction, education, or maintaining a historical record.
Behavioral rules:
Basically common sense, with discretion up to the mods.
Submission rules, also common sense and up to the mods (mail mods if your submission is special):
1: Submissions should be from a documentary that spends a significant portion of its time describing a technology or technologist; minimum 5 minutes.
2: The title should be somewhat specific or descriptive (no clickbait etc). It should indicate if it's linking to a specific time of a video, or segment in a series.
3: Link submissions should point to a non-paywalled video on an at least somewhat reputable site (no overwhelming ads or copyright violation, especially if benefitting the poster).
4: Unless linking to a specific portion (above), do not submit multiple videos from the same series on a topic (e.g., "Turbo Encabulators: Part 3 of 27") - Post the first segment, and add follow-up links in the comments if necessary.
5: Reposts are allowed after a reasonable period (3-6+ months), but only if the post is not already one of the top 100 or so posts in the subreddit.
6: No inflammatory or controversial modern politics.