When we look at the universe, what we see by eye or with our telescopes is only five percent of the universe. The rest, 95 percent is dark. Dark meaning, first of all, not visible to our instrument. Second, dark also indicates our ignorance. We don't know what's the composition of this part of the universe.
Fabiola GianottiThe top quark was discovered in 1995 and since then the Higgs has become an because the standard model was incomplete with out it.
Fabiola GianottiString theories, for instance, they require seven additional dimensions. So, as experimentalists we should, with our high-tech instruments like the Large Hadron Collider, just listen to nature and to what nature wants to tell us.
Fabiola Gianotti