Although most bacteria are harmless or often beneficial, several are pathogenic. One of the bacterial diseases with the highest disease burden is tuberculosis, caused by the bacterium Mycobacterium tuberculosis, which kills about 2 million people a year, mostly in sub-Saharan Africa.athogenic bacteria contribute to other globally important diseases, such as pneumonia, which can be caused by bacteria such as Streptococcus and Pseudomonas, and foodborne illnesses, which can be caused by bacteria such as Shigella, Campylobacter, and Salmonella.
exists and is an alternate of . The brooms are used to sweep the ice in front of a sliding rock. The friction created from sweeping melts the ice just a tiny bit, enough to decrease the friction between the rock and the ice, making the rock both slide farther and slide straighter (curl less).
THE BASICS. - Curling is played on a long, narrow sheet of ice with a marked target area, called the house, at each end. - Two teams, each with four players, take turns sliding 42-pound granite stones to the far side of the ice sheet. The objective is to get your stones closest to the center button of the house. - Players vigorously sweep the ice in front of the stone to keep it moving. The friction caused by the sweeping polishes the ice briefly, which makes the stones travel farther and straighter. - Each curling match is divided into ten ends.