As the holiday season kicks off, many of us will start warming up our ovens to bake those cakes, breads, candies and assorted goodies. Living at high altitude provides an extra challenge when following recipes. Although many foods pose few problems, recipes for baked goods developed at sea level can be hard for the cook.Need some expert advice? Come join Eagle Public Library at 6 p.m. on Monday for a special program, "The Science and Art of Food Preparation at Altitude.""At altitudes above 3,500 feet, the preparation of food may require changes in time, temperature and/or ingredients," said Glenda Wentworth, Colorado State University extension agent.Wentworth will offer insights into overcoming those cooking and baking challenges at high altitudes. Topics will include the effects of decreased pressure on food preparation and the adjustments needed.The CSU extension publication, "High Altitude Baking: 200 delicious recipes and tips for great cookies, cakes, breads and more: for people living between 3,500 & 10,000 feet," will be available for purchase. Copies are $14.95.