MEXICO Archaeologists are fighting to study a site they say could hold clues to the fate of the Olmecs, best known for the colossal stone heads they carved. They flourished from 1200 BC to 400 BC, then disappeared.

CALIFORNIA Culminating a four-year project involving the Getty Research Institute and 200 Los Angeles cultural organizations, the first directory of little-known archives and historical collections about the history of Los Angeles was published Monday. Most of these resources are unpublished and have not been easily accessible. Moore stunned history preservationists last month with an unsolicited donation of $140,000 in stock certificates to invigorate the struggling campaign to save the gothic 1856 stone mansion of pioneer John Marsh. Marsh, a cattle baron, doctor, farmer, gold miner and power broker unleashed the first wave of overland migration to California with widely distributed letters that beckoned settlers to come west.

ARIZONA To Wal-Mart executives, it represents a prime site for a new retail store in their inexorable march across the United States. The fate of the 35-acre parcel points up a growing national dispute over treatment of prehistoric sites on private land. Certain archaeological sites - those that come under federal purview - are protected. But private projects on private land are far less regulated. Save Old Scottsdale charges that the city has "desecrated" a historic site, the canal, which has been deemed eligible for the National Register of Historic Places. The canal, built between 1883 and 1885, was determined by the State Historic Preservation Office to meet the criteria of eligibility.

NEVADA Las Vegas Springs is listed on the national register of historic places because people have visited the artesian waters from 3000 B.C. or earlier, according to archaeological studies performed by UNLV for the impact statement.

UTAH,1249,100005542,00.html? The Opera House, built in 1891 at a cost of $13,000, was for many years the largest business establishment in Bountiful. A veteran of several historic conversion projects in Salt Lake City and elsewhere, Knowlton said he liked the Opera House's architectural features: exposed masonry, brickwork, high ceilings and maple floors on the second story.,1249,100005525,00.html? Pony Express riders carried letters and telegrams for 18 months in 1860 and 1861. They hoped to demonstrate that a central route through the Salt Lake area and Placerville, Calif., was passable even during the winter. Although the Pony Express ended in financial disaster upon completion of the transcontinental telegraph, it is remembered as a symbol of the Old West.

COLORADO The Golden Historic Preservation Board is discussing whether local historic designation can be given to the 35-foot pillars made of rough hewn native stone, each with a central pedestrian archway, to protect them. The pillars are on the National Register of Historic Places, but that really doesn't offer protection.

MONTANA In conjunction with the restoration of the former Dumas brothel, 45 E. Mercury St., the International Sex Worker Foundation has invited sex workers from around the world to Butte this summer to work on the project. ISWFACE President Norma Jean Almodovar has said that her group wishes to turn the Dumas into a museum to preserve its cultural and historic heritage.

[ Editor note -- Perhaps the ad campaign should be... "Historic Preservation. It does a bawdy good." ]

CYBERIA Ten percent of the cases occur in urban residents, and most of them spend some time in rural areas. Victims are predominantly male, and disproportionately Native American. The median age of people who get Hantavirus pulmonary syndrome is 39. Young children tend not to develop the pulmonary syndrome. Young, healthy adults tend to suffer the worst because their immune system's robust reaction to the infection actually triggers more damage to the body.,2107,57453-91701-652445-0,00.html The Urumchi mummies were preserved because they were buried in a geological formation of salt beds. The salt preserved the bodies and the textiles by drawing away the moisture. Microorganisms can't grow in a completely dry environment so they didn't attack the mummies or their clothing. The surviving textiles are a window into what the world was like 3,000 years ago. It's like time-tourism instead of eco-tourism. Back then, people spent more time making textiles than they spent producing and processing food. In fact, textile production was the most time-consuming of the ancient industries.