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History's of worst pandemic finally ended First globally spread pandemic is plague 1. Plague Three pandemic is responsible of single bacteria,yersinia pestis,a fatal infection is known as plague These are bacteria found mainly in rodants, particularly rats,and in the fleas that on feed them.human and other animal to usually contract bacteria from rodents bits This pandemic spread across Asia,euroup,north America by which effeted of this bacteria 40 million of people died. 2. Cholera-A victory for public health research Cholera is an infectious disease caused by a bacteria called "vibrio cholerae' The bacteria live in water that are somewhat salt and warm such as estuaries (mouth) and water along coastal areas People contract "vibrio cholerae" after river water drinking with preparing that water use cooking foods and these food eating contaminated with the bacteria such as raw or undercooked shellfish People protect themselves by few s...

Now I am discussing about interesting fact of "Area" I Hope you like it Look at the closed figure in the picture given below All of figure occupy some region of flat surface The amount of surface enclosed by a closed figure is called area You may guess the which figure has more area It is a difficult to us just by looking at these figures Thats reason we keep the graph paper where every square measure 1cm*1cm Then look at the picture given below. The square enclosed by the figure,some of enclosed completly,some of half enclosed,some less than half enclosed and some more than half The area is the number of centimetre square that are needed to cover it The area of one full square is taken as 1sq unit It more than half of square just count 1 sq unit It less than half of square just count 0sq unit It exactly half of square than count 1/2sq unit Lets example:- Calculate area of close figure. 1.fully filled square=11, . 11*1=11 2.half filled squ...

Look the picture its helpful to you forfor understanding of bacteria and viruses