Recommended Reading / Viewing. 1  Your engine manufacturer's operating instructions. 2  Mixture Magic (John Deakin) 3  EGT, CHT, and Leaning (Mike Busch) 4  Leaning Basics (EAA/Mike Busch) (video) 5  Leaning: The Advanced Class (EAA/Mike Busch) (video)
PCBs are a probable human carcinogen. Studies of PCBs in humans have found increased rates of melanomas, liver cancer, gall bladder cancer, biliary tract cancer, gastrointestinal tract cancer, and brain cancer, [1] and may be linked to breast cancer. PCBs are known to cause a variety of types of cancer in rats, mice, and other study animals. [2].
Article Summary: Bacteria is the most useful microorganism in the environment and beneficial for human beings. But it also has some harmful effects on human body.... The planet earth is full of bacteria and they play an important role in the different functions whether they are related to humans, animals or plants.hough bacteria are mostly beneficial for the human body but if the person is weak and his immune system does not fight against diseases then these beneficial bacteria can also cause infections in the body.