More Notable Events on December 26: 1991 Jack Ruby's gun sells for $220,000 in auction 1990 Garry Kasparov beats Antatoly Karpov to retain chess championship 1982 TIME's Man of the Year is a computer 1968 Led Zeppelin's concert debut in Boston as opener for Vanilla Fudge 1878 1st U.S. store to install electric lights, Philadelphia