Please don't post dismissive comments like this. If you know more, share what you know so the rest of us can learn. If you don't want to do that or don't have time, that's fine, but then please just don't post anything.

https://news.ycombinator.com/newsguidelines.html

Hurd is like Mazda Wankel engine. :-)

Except Mazda actually sold millions of cars that ran down the road with the Wankel engine.

The wankel was actually like Hurd at one point, everybody thought it would be the next big thing and many car manufacturers had wankel engines. Mazda stuck it out and funded it into production.

Are you referring to the micro-kernel part?

Yes