LOS ANGELES (AP).- A 10-month-old baby who lived in Peru 6,420 years ago and a 17th-century nobleman; a South American woman with a tattoo on each breast and one on her face, a woman who had tuberculosis, a child who had a heart condition and a youngster with a facial tumor. “Mummies of the World” is being called the largest traveling exhibition of mummies ever assembled. The 45 mummies and 95 artifacts in the show come from 15 museums in seven countries, said Marc Corwin, CEO of American Exhibitions Inc. The show opens Thursday at the California Science Center, then will go on a three-year tour across the country. The 10-month-old baby, known as the Detmold child, is on loan from the Lippisches Landes museum in Detmold, Germany. The Orlovits family was with a group of mummies found in 1994 in a