Study Outline. 1  Microbiology-An Introduction. 2  Microbiology is the study of organisms too small to be clearly seen by the unaided eye (i.e., microorganisms); these include viruses, bacteria, archaea, protozoa, algae, and fungi.tudy Outline. 1  Microbiology-An Introduction. 2  Microbiology is the study of organisms too small to be clearly seen by the unaided eye (i.e., microorganisms); these include viruses, bacteria, archaea, protozoa, algae, and fungi.
Well, according to the CIA's The World Factbook, the current average human lifespan is approximately 66 and a half years. On average the current life expectancy for the world is about 67.2 years.
Men are catching up. American men now live just five years less, on average, than women, closing a gap that once approached eight years. Male life expectancy hit a record 75.2 in 2004, the federal Centers for Disease Control and Prevention recently announced. Nice work, guys. CDC data suggest you did it by smoking less and taking other steps to reduce the risks of cancer and heart disease.