I was trying to figure out if a solar water heater would be viable, but all that I got out of it was that solar water heaters are quite complicated.
I wasn't logged into YouTube, so it was showing me random stuff, or at least not get-rich-quick schemes like [checks history] Linus Tech Tips, apparently.
This guy came up with his own aircrete generator. I guess that it is simpler than HoneyD'oh Carpenter's:
This sounded cool, but he kept referring to things that he wasn't discussing in that video, and he didn't show the whole dome-building process.
It didn't seem like he showed very much of it:
This was more interesting. The guy said that he tried other guys' aircrete formulae and they didn't work, but he tried different stuff, and shredded recycled styrofoam worked for him.
He made a 2-story building out of it and it held up without reinforcement:
Well, the first guy may have been trying to sell DLCs. I don't know if the other guys were directly trying to sell anything. They seemed to give all of the information in the video.
I really should have gotten to bed hours ago. I am already 15% through Xistday!