Lacking any such linkages to the real world, Smolin's three roads instead become scarcely more than three fashions for quantum gravity, with little to distinguish among them.
Dr. Douglas of Rutgers has challenged that hope, saying string theory may have so many solutions that physical measurements can not distinguish among them.
Her sleeping state, her dozing state, and her waking state now had such delicate and shifting boundaries that it was hard to distinguish among them.
Dried mushrooms are far from all the same — you could distinguish among them in a snap, not only by taste but also by texture.
Spanx now offers more than two hundred different products, and executives at the company, which is privately held, and reported three hundred and fifty million dollars in global retail sales in 2008, worry that customers are having trouble distinguishing among them.
TIGR scientists said they had communicated their list of DNA differences to Dr. Keim, who is testing the Ames strain samples in his collection to see if he can now distinguish among them.
In the first test, a Minuteman III intercontinental ballistic missile launched from Vandenberg Air Force Base, Calif., released 20 objects in flight, as a way to test the ability of a prototype ground-based radar to distinguish among them.
