I'll mention a few YouTube channels that have quite a large following, but maybe some people aren't aware of them:

• Kurzgesagt has animated videos on a variety of real-world problems, theories, etc. 
• Grant Sanderson's 3Blue1Brown describes math concepts and related topics with animations and visualizations from a perspective of how you could "re-derive" / "re-invent" them yourself.
• Ben Eater explains fundamentals of electronics, computers, CPUs, and other related topics.

There are also many math channels mentioned in A Layman’s Guide to Recreational Mathematics Videos.

Name: Machine Thinking

Type: YouTube channel

Link: https://www.youtube.com/c/machinethinking/

Description: Over a dozen videos analyzing the technology behind the industrial revolution. Loosely speaking it's a channel dedicated to progress studies. The 1751 Machine that Made Everything is a particularly good video.

Positives:

• Unique; haven't come across any other channels similar
• Detailed and technical
• Establishes the importance of industrial technology in building our modern world of abundance (progress mindset)
• Good narrator voice

Negatives:

• The subject matter will be dry for some
• Low production value

Name: Fall of civilizations

Type: YouTube channel

Link: https://youtube.com/c/FallofCivilizationsPodcast

Description: There are 14 episodes so far. Each episode describes the collapse of a once flourishing civilization. The authors tries to explain how the people felt when they witnessed their world disappeared in their lifetimes. It is probably the third time I recommend this podcast here in LW

Positives:

• super high production value
• full of interesting insights of many different civilizations
• I personally find them relaxing

Negative:

• some episodes are really long (this might be a positive)
• not apt for people looking for quicky-delivered information

David Metzler's "Ridiculously Huge Numbers" (YouTube)

Link: https://www.youtube.com/user/davidmetzler/playlists

Description: A comprehensive review of how mathematicians think about and notate huge numbers. 

Positives: 

• Metzler starts with concepts and notation that most high school students and even precocious middle school students have seen and works "up" from there.
• Each video is relatively short and covers a "huge number" topic or two that most mathematically-inclined people can follow.

Negatives:

• It's a long series, and after the first few videos, the concepts and notation become quite esoteric.