sentences:  Strange B mesons are noted for their ability to oscillate between matter and antimatter via a box-diagram with measured by CDF experiment at Fermilab.That is, a meson composed of a bottom quark and strange antiquark, the strange meson, can spontaneously change into an bottom antiquark and strange quark pair, the strange meson, and vice versa.On 25 September 2006, Fermilab announced that they had claimed discovery of previously-only-theorized Bs meson oscillation.