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].
They affect our everyday life, and in fact we could not live without them. Bacteria perform necessary functions for humans; the most important is the breakdown of food in our intestines. The average human actually has around 1.2 kilograms of bacteria in their body. http://www.lifesci.utexas.edu/courses/mcmurry/fall97/13/mattpage.html A normal human being hosts about 1.2 kilograms of bacteria. The bulk are in the gut lumen, and the rest in the skin, oro-pharynx, and genitalia.