[Retric]

Interesting, I have heard it suggested that tunneling is one of those things that's clearly going on, but not necessarily relevant. Much like how relativity is required for sufficiently accurate solar system models, but you can generally ignore it.

[dekhn]

That's possible, but where is the evidence to show it? I'm not saying tunnelling isn't occuring (the laws of physics permit it) but if it's not relevant, who cares?