|
|
|
Distribution of glaciers in North America (a) in the late twentieth century, and (b) 18,000 years ag
Astronomers identified 12-billion-year-old white dwarf stars only 100 light years away from Earth
Uranus revolves around the Sun once every 84 Earth years. Its average distance from the Sun is rough
Results from sequential study of two cohorts tested at three ages and at three different points in t
On March 25, 1911, as scores of young factory girls leaped to their deaths from the eighth, ninth, a
Patients Older than 60 Years of Age