News
- Paleontology
DNA analysis reveals extinct type of wolf
New genetic analyses of the remains of gray wolves found in Alaska indicate that a distinct subpopulation of that species disappeared at the end of the last ice age, possibly because of its dietary habits.
- Paleontology
Rodents tell a geologic tale
The sudden appearance of many new species of rodents in Chile about 18 million years ago may have marked the rise of the southern Andes.
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Dementia warning
A long-term study of people ages 65 and older in England and Wales indicates that the prevalence of brain disorders of memory and thinking, including Alzheimer's disease, increases sharply in aging populations.
