Life and living beings

Life is a characteristic distinguishing physical entities having signaling and self-sustaining processes from those that do not, either because such functions have ceased (death), or because they lack such functions and are classified as inanimate. Biology is a science concerned with the study of life.
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The smallest contiguous unit of life is called an organism. Organisms are composed of one, or more, cells, undergo metabolism, maintain homeostasis, can grow, respond to stimuli, reproduce and, through evolution, adapt to their environment in successive generations. A diverse array of living organisms can be found in the biosphere of Earth, and the properties common to these organisms—plants, animals, fungi, protists, archaea, and bacteria—are a carbon- and water-based cellular form with complex organization and heritable genetic information.
The Earth was formed about 4.54 billion years ago. The earliest life on Earth existed at least 3.5 billion years ago, during the Eoarchean Era when sufficient crust had solidified following the molten Hadean Eon. The earliest physical evidence for life on Earth is biogenic graphite in 3.7 billion-year-old metasedimentary rocks discovered in Western Greenland and microbial mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia. Nevertheless, several studies suggest that life on Earth may have started even earlier, as early as 4.25 billion years ago according to one study, and even earlier yet, 4.4 billion years ago, according to another study. The mechanism by which life began on Earth is unknown, although many hypotheses have been formulated. Since emerging, life has evolved into a variety of forms, which biologists have classified into a hierarchy of taxa. Life can survive and thrive in a wide range of conditions.
Biology Basics: Characteristics of Life. (n.d.). Retrieved August 30, 2014, from http://biology.about.com/od/apforstudents/a/aa082105a.htm
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Microscope Facts

MICROSCOPE
Microscope Facts 1: History
The first usage of microscope can be traced back the life of the first century Romans. The ancient people used glass lenses to magnify objects.
Microscope Facts 2: the first microscope
The first microscope was created by Zaccharias and Hans Janssen. Both were the Dutch spectacle markers who placed two lenses in a tube at the end of 16th century.
Microscope Facts 3: Father Of Microscopy
Even though the first microscope was created by Zaccharias and Hans Janssen, the credit of the father of Microscopy was taken by Anthony Leeuwenhoek.   The creation of his microscope was more sophisticated because it magnified by a factor of 270.
Microscope Facts 4: Compound microscopes
If you find two lenses located at opposite end of a closed tube, it is called as a compound microscope. If you want to get sophisticated microscope, check the electron microscope.  The usage of electron in a vacuum characterized the microscope. The image will be displayed in a monitor.
Microscope Facts 5: Scanning-Probe Microscopes
If you want to get the three dimensional image form the object magnified by microscope, you need to use scanning-probe microscopes. The narrow and sharp metal point will be used to scan and magnify the object surface.
Microscope-Facts
Microscope Facts 6: usage of microscope
Microscope is very important in the life of people especially doctor. When he or she wants to diagnose disease and examine the tissue sample, they will use microscope to check it.
Microscope Facts 7: Scientists
Microscope is also important to the life of scientists.  The health of an ecosystem can be seen easily by checking the water and soil samples via microscope.  The people who were involved in computer production also use the tool to examine the detail part of inner computer.
Microscope Facts 8: flea glasses
Flea glasses are a term to call the first microscope created by Zacharias and Han Jansen in 1950s. The main purpose of their microscope was to examine small insects. Check insect facts here.
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Microscope Facts 9: Robert Hooke
Due to the invention of microscope, Robert Hooke was able to study cells. He put honeycomb structure of a cork by using microscope.
Microscope Facts 10: Marcello Marpighi
People always call Marcello Marpighi as the father of microscopic anatomy. He discovered red blood cells and taste buds.
10 Interesting Microscope Facts. (n.d.). Retrieved August 30, 2014, from http://www.myinterestingfacts.com/microscope-facts/