== Mention of Lisi's "theory of everything" == 

  removed mention of Lisi's Theory of Everything (again).  I think this is wrong.  Even though the theory itself has not been validated (and I, personally, think it's all hogwash), the fact that this theory exists is a fact, and a notable one, so should be somehow mentioned on the article.  And the edits which have been removed did exactly that, with acceptable source.  Of course, the article should be carefully worded so as not to imply that the theory is correct or even interesting, merely that it has been proposed: but to not even mention it would be like if the article on mercury didn't mention alchemy.  Many people will probably be reading the article on E8 because they've heard about Lisi's theory, and it must be made clear, at the very least, that it is indeed the object in question (they have reached the right E8, not some other mathematical object which happens to have the same name).