Word: quarks
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After nearly two decades of searching scientists presented nearly conclusive evidence of the existence of the top quark believed to be the last undiscovered building block of matter...
Though physicists were reluctant to term the results a "discovery," they said the new "strong evidence" for the top quark was the keystone they needed to validate the Standard Model, the prevailing theory explaining the constituents of matter...
...quarks occur in pairs: up and down, charm and strange and top and bottom. A proton, for example, consists of two up quarks and one down quark...
SCIENCE: Tracks of the Last Quark...
After a 17-year search, scientists at the Fermi National Accelerator Laboratory near Chicago report that they may have confirmed the existence of the sixth -- and last -- of the quarks, ghostly particles that are the smallest units of matter. Dubbed a top quark, the elusive particle weighs as much as a gold atom; it enjoyed a brief reign about a trillionth of a second after the Big Bang. If the finding is confirmed, scientists will have validated three decades' worth of work that gave rise to the so-called Standard Model of particle physics...