According to The Sunday Mail a 2004 newspaper report notes that no worries has begun to be used in American English.[21] Writing in a 2004 article for The Advertiser, Samela Harris comments: "The Americans have no idea of the etymology of 'no worries'. So, while they may cheerily adopt our 'no worries' mantra, 'no worries' will never catch on as an attitude."[22] According to Tom Dalzell, author of two books on slang usage in the United States, linguistics experts are not certain how the expression became popular in that country. One possibility not mentioned in the source is the prominent position of this phrase in the lyrics of song "Hakuna Matata" in the popular 1994 Disney film The Lion King.[23] Usage of the term by Steve Irwin on The Crocodile Hunter, as well as attempts by members of the American press to imitate the expression during the 2000 Sydney Olympics, have been put forth as theories explaining the pervasiveness of the expression in the United States.[23] Linguistics professor Kate Burridge writes in her 2004 book Weeds in the Garden of Words that expressions including "no worries", "absolutely", and "bottom line" have become less prevalent in favor of newer sayings.[24] The phrase has had some usage in Canadian English.