This document discusses medical quackery and identifies quacks. It defines quackery as practicing medicine without scientific methods, which can harm sick people. Quacks sell unapproved remedies without formal education or licensing. Some signs of quacks are that they advertise themselves, work from home, claim secret formulas, lack sanitation, and use the same treatment for all illnesses. The effects of quackery can be wasting money, prolonging illness, false hope, or death if seriously ill people see quacks instead of doctors. Usual victims seek alternative treatments for serious conditions like cancer or pains, or want to avoid doctors and surgery.