String theory, which took off in 1984, posits that elementary particles such as electrons are not points, as standard physics had it. They are, instead, vibrations of one-dimensional strings 1/100 billion billionth the size of an atomic nucleus. Different vibrations supposedly produce all the subatomic particles from quarks to gluons. Oh, and strings exist in a space of 10, or maybe 11, dimensions. No one knows exactly what or where the extra dimensions are, but assuming their existence makes the math work.

String theory, proponents said, could reconcile quantum mechanics (the physics of subatomic particles) and gravity, the longest-distance force in the universe. That impressed particle physicists no end. In the 1980s, most jumped on the string bandwagon and since then, stringsters have written thousands of papers.

But one thing they haven't done is coax a single prediction from their theory. In fact, "theory" is a misnomer, since unlike general relativity theory or quantum theory, string theory is not a concise set of solvable equations describing the behavior of the physical world. It's more of an idea or a framework.

Partly as a result, string theory "makes no new predictions that are testable by current _ or even currently conceivable _ experiments," writes Prof. Smolin. "The few clean predictions it does make have already been made by other" theories.

Hahaha, its so great to hear someone trash an entire field of study, when its not a fundy or a crackpot!