Flu Pandemics in the 20th Century
If a flu virus emerges that is either new or that has not circulated in many years, and if it is able to spread easily from person to person, it could quickly travel around the world and cause serious illness and death for millions of people. This is called a…
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Medicine
Why Is Blood Pressure Two Numbers?
Blood pressure might better be called heart pressure, for the heart's pumping action creates it. To measure…
Geology
Devils Postpile National Monument
Established in 1911 by presidential proclamation, Devils Postpile National Monument protects and preserves the…
Geology
A Great Sunset Takes A Few Clouds
Although the twilight sky can certainly inspire awe even when it is devoid of clouds, the most memorable…
Engineering
Smoke Detectors
How does a smoke detector 'know' when there is a fire? Smoke detectors use one of two different methods to do…