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].
Environmental changes to a microbe can also make it a health threat to humans, creating an even bigger concern now that different issues like global warming seem to be taking effect. The battle between humans and disease-causing microbes is far from overâ¦ in fact; you may say its just beginning.