 In 1995, the CDF experiment and DØ experiment collaborations announced the discovery of the top quark, and by 2007 they measured its mass (172 GeV) to a precision of nearly 1%.In 2006, the CDF collaboration reported the first measurement of Bs oscillations, and observation of two types of sigma baryons.In 2007, the DØ and CDF collaborations reported direct observation of the "Cascade B" () Xi baryon.