A Satellite Of Our Own
The regular daily and monthly rhythms of Earth's only natural satellite, the Moon, have guided timekeepers for thousands of years. Its influence on Earth's cycles, notably tides, has also been charted by many cultures in many ages. More than 70 spacecraft have…
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Geology
The Hydrology of Drought
A drought is a period of drier-than-normal conditions that results in water-related problems. Precipitation…
Physics
What Is Radiofrequency Energy (Rf)?
Radiofrequency (RF) energy is another name for radio waves. It is one form of electromagnetic energy that…
Medicine
Civets Lesson
Recently a Chinese television producer fell ill with Severe Acute Respiratory Syndrome, better known as SARS.…
Astronomy
The Minor Planets
Asteroids are rocky fragments left over from the formation of the solar system about 4.6 billion years ago.…