Uncategorized
- Earth
What’s in the Dirt?
Curious about the abundance of various chemical elements in the area where you live? The U.S. Geological Survey offers a database of more than 60,000 chemical analyses of stream sediment and soil in different parts of the United States. Color-coded maps provide county-by-county data on the concentrations of such elements as mercury, arsenic, selenium, and […]
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Infectious Evolution: Ancient virus hit apes, not our ancestors, in the genes
A potentially deadly infection wormed its way into the DNA of ancestral chimpanzees and gorillas between 4 million and 3 million years ago, thus altering the evolution of these African apes while keeping clear of human ancestors on that same continent.
