2004
- Biology – Presented to Ben Wilson of the University of British Columbia, Lawrence Dill of Simon Fraser University, Canada, Robert Batty of the Scottish Association for Marine Science, Magnus Wahlberg of the University of Aarhus, Denmark, and Håkan Westerberg of Sweden's National Board of Fisheries, for showing that herrings apparently communicate by farting.
- It has been suggested that the study of this phenomenon has had major political consequences. Following the sensational stranding of a Soviet submarine deep inside Swedish waters on October 27, 1981, the Swedish navy initiated a large-scale campaign to guard Swedish territorial waters from the perceived threat of infiltration by foreign submarines, despite the Soviets consistently asserting that the stranding had occurred due to navigational errors. The "submarine hunts", which lasted throughout the 1980s and early 1990s, have been a heavily debated issue in Sweden, as to whether or not there ever was any factual substance to the claims of Soviet infiltration. One widely reported piece of "evidence" were several sound recordings of what the Swedish navy suspected to be foreign submarines. Oceanographers and marine biologists were invited to study the recordings and would eventually find that the sounds heard were most probably produced not by submarines, but in fact were the noises made when herring passed gas. In a reportage by the Swedish science magazine "Vetenskapens värld" ("World of science") televised on April 16, 2012, it's suggested that these findings were important in putting an end to the costly "submarine hunts" which had continued for more than a decade, with Ig Nobel laurate Håkan Westerberg guessing that this would have saved Swedish tax payers hundreds of millions in SEK.
- Chemistry – Presented to The Coca-Cola Company of Great Britain, for using advanced technology to convert liquid from the River Thames into Dasani, a brand of bottled water, which for precautionary reasons has been made unavailable to consumers.
- Economics – Presented to the Vatican, for outsourcing prayers to India.
- Engineering – Presented jointly to Donald J. Smith and his father, Frank J. Smith, of Orlando, Florida, for patenting the comb over (U.S. Patent 4,022,227).
- Literature – Presented to The American Nudist Research Library of Kissimmee, Florida, for preserving nudist history so that everyone can see it.
- Medicine – Presented jointly to Steven Stack of Wayne State University, Detroit, Michigan, and James Gundlach of Auburn University, Auburn, Alabama, for their published report "The Effect of Country Music on Suicide".
- Peace – Presented to Daisuke Inoue of Hyōgo Prefecture, Japan, for inventing karaoke, thereby providing an entirely new way for people to learn to tolerate each other.
- Physics – Presented jointly to Ramesh Balasubramaniam of the University of Ottawa, and Michael Turvey of the University of Connecticut and Haskins Laboratory, for exploring and explaining the dynamics of hula-hooping.
- Psychology – Presented jointly to Daniel Simons of the University of Illinois at Urbana-Champaign and Christopher Chabris of Harvard University, for demonstrating that when people pay close attention to something, it's all too easy to overlook anything else – even a woman in a gorilla suit. (See inattentional blindness).
- Public Health – Presented to Jillian Clarke of the Chicago High School for Agricultural Sciences, and then Howard University, for investigating the scientific validity of the five-second rule about whether it's safe to eat food that's been dropped on the floor.
Read more about this topic: List Of Ig Nobel Prize Winners