Quack can refer to: Wikipedia does not have an article with this exact name. ... Wiktionary is a Wikimedia Foundation project intended to be a free wiki dictionary (hence: Wiktionary) (including thesaurus and lexicon) in every language. ...
slang for "Hey, what's up?" First said by Markus Kirk.
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Quack medicines often had little in the way of active ingredients, or had ingredients which made a person feel good, such as what came to be known as recreational drugs.
Widely marketed quack medicines (as opposed to locally produced and locally used remedies), often referred to as Patent medicines, first came to prominence in Britain and the British colonies, including North America, in the 17th and 18th centuries.
The quacks who sold them were called "snake oil peddlers", and usually sold their medicines with a fervent pitch similar to a fire and brimstone religious sermon.
A quack will often reply that his ideas have evidence, just not the kind accepted by "science." The problem with this is that science is no more and no less than sum total of what we have learned about evaluating general empirical claims and their evidence.
Quacks want to find some room in between, but they cannot explain why we should accept the kind of evidence in their case that has proven so bad in other cases.
Quack theorists often distort the rest of science is in order to make their favored notions seem more equal in comparison.