Did cause severe diarrhea.” Others can cause tuberculosis and

Did you know that according to livescience.com, “bacteria are microscopic single-celled organisms that thrive in diverse environments”? There are over ten million different types of bacteria!  They can live within soil, in the ocean, or inside the human gut.  I am very interested in seeing what type of cleanser best kills these bacteria.  Hands are the part of the human body that are most in contact with the outside world.  It is extremely easy to come into contact with different bacteria and to transfer them to other objects and even other people.  Therefore, I am going to be testing to see if hand soap or hand sanitizer kills the most bacteria on the hands.                                         Bacteria can be harmful at times, but can also be helpful.  According to enotes.com, some that are helpful include “E. Coli which are found in the intestines of humans and aid digestion.  Streptomyces is used in making antibiotics. Rhizobium are helpful bacteria found in the soil. They convert nitrogen in the soil.”  On the contrary, they can be very harmful at times.  “E. Coli can be harmful if you eat or drink a substance that has been contaminated by it.  Listeriosis can make people very ill and can eventually lead to death.  Listeriosis can be found in shellfish, cold cuts, and unpasteurized milk.  Salmonella is extremely dangerous and lives in the intestinal tracts of humans.  Foods like poultry and eggs can be contaminated with salmonella and can cause severe diarrhea.”  Others can cause tuberculosis and anthrax.  The human body contains numerous types of bacteria that can protect us against many harmful bacteria.  According to discovermagzine.com, “there are estimated to be around 5 million trillion trillion bacteria that live on Earth.  Lined up end to end, bacteria would stretch some ten billion light years.  Bacteria was first discovered by Antonie van Leeuwenhoek in 1674 when he was using his microscope and spotted tiny swimming “animacules”.  Most bacteria still have yet to be identified.”

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