[danesparza]

I have to disable safety mode to watch these? WTF?

[jasonkostempski]

Physics is a dangerous thing.

[teraflop]

I don't know what "safety mode" is, but I didn't need to disable anything to watch the videos.

[charonn0]

It's an optional Youtube setting.

https://support.google.com/youtube/answer/174084?hl=en

[differentView]

Feynman is known to enjoy looking at titties while working, just warning the prudes.