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Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
Defying thousands of years of conventional wisdom, scientists are reporting that it is possible for
This Moche ceramic depicts a spider, and dates from around 300 CE
The declining age of menarche over the past 150 years has been measured in many European countries,
Approximately 40 percent of farmers in the United States are 55 years old or older
Population age 65 and over and age 85 and over, selected years 1900-2008 and projected 2010-2050.