well considering Yahoo doesn't power their own search engine, maybe they're okay with teams who are adept at creating great UI and UX wrappers around 3rd party licensed technology.
This is actually quite sad considering Yahoo has an excellent research division in Barcelona in information retrieval. Maybe they should start funding them more instead of letting them fund themselves with huge european projects.
No, they take the links from bing and provide a more interactive experience on top of it. I just finished reading a research paper last month where they explain it. The concept made sense but their execution is really terrible. Their web page just looks too cluttered, distracting away from the users search experience.