Far from a mournful affair, the holiday is a time of celebration and warmth. Correspondent Enrique Acevedo talks with Mexico City's minister of culture Claudia Curiel De Icaza about the city's celebrations; with acclaimed chef Elena Reygadas about baking traditional pan de muerto; and with author Regina Marchi, who has documented the holiday's growing popularity on both sides of the border in her book, "Day of the Dead in the U.S.A."