What Is High Blood Pressure?
High blood pressure is a blood pressure reading of 140/90 mmHg or higher. Both numbers are important. About one in every four American adults has high blood pressure. Once high blood pressure develops, it usually lasts a lifetime. The good news is that it can…
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Medicine
What Is a Spinal Cord Injury?
Although the hard bones of the spinal column protect the soft tissues of the spinal cord, vertebrae can still…
Geology
What is an Estuary?
An estuary is a partially enclosed body of water formed where freshwater from rivers and streams flows into…
Physics
X-Rays - Another Form of Light
A new form of radiation was discovered in 1895 by Wilhelm Roentgen, a German physicist. He called it…
Astronomy
The Oldest Light in the Universe
A NASA satellite has captured the sharpest-ever picture of the afterglow of the big bang. The image contains…