There are new topics unlocked at JoVE (a scientific, peer-reviewed video journal).
The focus is on detailed instructions for scientific experiments.
Under https://www.jove.com/journal you find the different subjects and you can also search for specific topics.
(maybe via SSL-Gate or VPN)
There might be problems with Firefox. You can enable "play DRM content" in the options menu or you can watch the video in the "embed"-mode.
There are no problems with Chrome or Edge.