Author Question: Tears, saliva, urine, mucous secretions, and sweat act as chemical barriers. (Read 34 times)



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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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