Scientists Explain Feline Purring

Manuka writes: "The Daily Telegraph has an article that tells us that scientists have discovered that purring in cats is actually a self-healing mechanism that strengthens their bones and lends weight to the extraordinary resilience of felines. Tigers lack this mechanism for some reason. They are also exploring the possibilities of replicating this mechanism in humans with 'sound treatment,' to help treat bone disorders." This article does not address how cats purr, though, and that seems like just as burning a question, nor does it explain how those low-freq sounds actually do achieve the benefits attributed to them.