SAN FRANCISCO, Oct.

An outdoor, interactive science museum has opened along San Francisco's waterfront, offering visitors both toys and tools to explore scientific principles. The Outdoor Exploratorium at Fort Mason, a historic military post established in the 1860s, takes advantage of the natural and man-made landscape.

By William Mullen, Chicago Tribune Feb. 15--Powerful computer technology, one of the wonders of the early 21st Century, is being used to re-create one of the 19th Century's greatest events, the 1893 World's Columbian Exposition.