Unearthed in a cave at the Tham Din archaeological site ... was found near charcoal and ashes, indicating that a fire had been lit during the burial process. Archaeologists suggest that the ...

From about 5,000 to 2,000 years ago, Native Americans mined gypsum from the cave walls and lit their way with torches made of river ... charred piece of cane an inch long and held it to my nose. It ...

Researchers use a portable fluorescence spectrometer to analyze the glowing formations in underground caves. Now, researchers ...