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Archive for June 2011

Who Discovered Cadmium

Cadmium, symbol Cd, is a chemical element with the atomic number 48. It is a soft metal and appears as a bluish-white color. It is chemically similar to both zinc and mercury, and shares common attributes with each. It is a relatively scarce element and usually occurs as a minor component of zinc ores. Although it was once used for stabilizing plastic and to prevent corrosion of steel, it is no longer used for many applications because of its toxicity. In fact, the sale and use of cadmium is heavily restricted in Europe.

How Do Viruses Reproduce

A virus is a microscopic life form that requires a host organism to live and reproduce. They are infectious and often cause unpleasant and long lasting symptoms. There are over 5,000 viruses described in detail and millions of different types in the world today. These infect not only humans, but other animals, plants and bacteria. They come in many different shapes and can appear as a simple ball shaped organism to a complex spider like organism.