I'm also quite a fan of these;

https://www.youtube.com/watch?v=fJVhwg5o0vA

But they seem to going out of fashion at the moment based on some rather dubious science. They haven't built a new one in the UK for about 40 years now and are getting rid of the ones they had. I'm not a fan of poverty as it is quite injurious to ones health and life expectancy.