Neurogenesis
Until recently, any doctor would have told you that when you lose brain cells, you can never replace them. Scientists now know that the human brain has the ability to regenerate brain cells, or neurons, a process known as neurogenesis, in at least the…
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General Science
NASA's First Historic Challenge
In a time of uncertainty at home and abroad, an American president proposes bold new steps in the exploration…
Astronomy
A Giant X-Ray Machine
The first clear detection of X-rays from the giant, gaseous planet Saturn has been made with NASA's Chandra…
Mathematics
Unit Of Luminous Intensity (candela)
Originally, each country had its own, and rather poorly reproducible, unit of luminous intensity; it was…
Biology
Our Brains: A Wasted Resource?
Have you ever heard people say, 'Human beings use only 10 percent of their brains?' It implies that some…