24/7 Wall St. Closing Bell — February 4, 2013: Markets Slump on Europe Mess (YHOO, MRK, GOOG, CVX, BRCM, CYOU, GCI, HUM, GOLD, RCL, SPG, CLX, APC, BIDU, EW, YUM, AGCO, AGN, ACI, ADM, ARMH, BP, ETN, EL, K, SIRI, BBRY, APKT, ORCL, MHP)