deceit". The term "horseshit" is a near synonym. An occasionally used South African English equivalent, though more common in Australian slang, is "bull dust". Although there is no confirmed etymological connection, these older meanings are synonymous with the modern expression "bull", generally considered and used as a contraction of "bullshit". Another proposal, according to the lexicographer Eric Partridge, is that the term was popularized by the Australian and New Zealand troops from about 1916 arriving at the front during World War I. Partridge claims that the British commanding officers placed emphasis on bull; that is, attention to appearances, even when it was a hindrance to waging war. The Diggers allegedly ridiculed the British by calling it bullshit. In the philosophy of truth and rhetoric Assertions of fact "Bullshit" is commonly used to describe statements made by people concerned with the response of the audience rather than with truth and accuracy. On one prominent occasion, the word itself was part of a controversial advertisement. During the 1980 U.S. presidential campaign, the Citizens Party candidate Barry Commoner ran a radio advertisement that began with an actor exclaiming: "Bullshit! Carter, Reagan and Anderson, it's all bullshit!" NBC refused to run the advertisement because of its use of the expletive, but Commoner's campaign successfully appealed to the Federal Communications Commission to allow the advertisement to run unedited. Harry Frankfurt's concept In his essay On Bullshit (originally written in 1986, and published as a monograph in 2005), philosopher Harry Frankfurt of Princeton University characterizes bullshit as a form of falsehood distinct from lying. The liar, Frankfurt holds, knows and cares about the truth, but deliberately sets out to mislead instead of telling the truth. The "bullshitter", on the other hand, does not care about the truth and is only seeking to impress: Frankfurt connects this analysis of bullshit with Ludwig Wittgenstein's disdain of "non-sense" talk, and with the popular concept of a "bull session" in which speakers may try out unusual views without commitment. He fixes the blame for the prevalence of "bullshit" in modern society upon anti-realism and upon the growing frequency of situations in which people are expected to speak or have opinions without appropriate knowledge of the subject matter. Several political commentators have seen that Frankfurt's concept of bullshit provides insights into political campaigns. Gerald Cohen, in "Deeper into Bullshit", contrasted the kind of "bullshit" Frankfurt describes with a different sort: nonsense