XYIENCE hosts autograph-signing with Wanderlei “The Axe Murderer” Silva at local c-store. Circle K and XYIENCE, maker of Xenergy, the official energy drink of the UFC, are inviting mixed martial arts (MMA) fans to meet XYIENCE team athlete Wanderlei Silva, who fights in the UFC’s middleweight division. Silva is scheduled to sign autographs at the…