West Indian Manatee, (Trichechus manatus)
Christopher Columbus was the first European to report seeing a manatee in the New World. To Columbus, and other sailors who had been at sea for a long time, manatees were reminiscent of mermaids -- the mythical half-fish, half-woman creatures of the ocean.…
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Medicine
What Is High Blood Pressure?
High blood pressure is a blood pressure reading of 140/90 mmHg or higher. Both numbers are important. About…
Chemistry
Catalysts
Chemical reactions are interactions between atoms and molecules that result in a change in their relative…
Medicine
What is Herd Immunity?
No vaccine is 100% effective and usually does not work in 5% of those immunized. In addition, another 5% lose…
Astronomy
Two Face? Absolutely!
During the Viking missions to Mars in the mid 1970s, the planet was imaged from orbit by the Viking 1 and 2…