I've just read in the first pages of The Elegant Universe that Greene believes that all fundamental laws should be contained in the microscopic domain, all other laws are derived. Is it really so evident that the laws of thermodynamics are derived and not fundamental? The second law, is it clear that it is not fundamental? Also, what would be the definition of a fundamental physical law? Is it one not derivable from others? Is this definition free of loopholes? Again, is it completely clear that the second law is solely derived from others? I am pretty sure that it has an almost fundamental status, doesn't it?