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Something mystified me about this article. Apparently, preservation experts are concerned that microorganisms could wipe out Stone Age cave paintings, as if this were an urgent threat. Has something altered the caves in which these paintings appear that has invited intensified bacterial growth? Don McMillanModesto, Calif. What threatens the paintings is a modern scourge: tourists. […]
- Earth
Buried Treasures
Geologists have long understood the chemical processes that sculpt many cave formations, but they've only recently come up with a physical model that explains some of their shapes.
- Health & Medicine
Ultrasound’s New Focus
No longer limiting the use of sound waves to diagnostic medicine, researchers are studying high-intensity focused ultrasound as a treatment for uterine fibroids, breast cancer, prostate cancer, and other cancers.
