Polywater
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Polywater was a hypothetical polymerized form of water that was the subject of much scientific controversy during the late 1960s. It was later found to be illusory, and today is used as an example of pathological science.

# Background
The Soviet physicist Nikolai Fedyakin, working at a small government research lab in Kostroma, Russia, had performed measurements on the properties of water that had been condensed in, or repeatedly forced through, narrow quartz capillary tubes. Some of these experiments resulted in what was seemingly a new form of water with a higher boiling point, lower freezing point, and much higher viscosity than ordinary water, about that of a syrup.
Boris Derjaguin, director of the laboratory for surface physics at the Institute for Physical Chemistry in Moscow, heard about Fedyakin's experiments. He improved on the method to produce the new water, and though he still produced very small quantities of this mysterious material, he did so substantially faster than Fedyakin did. Investigations of the material properties showed a substantially lower freezing point of 40 C or less, a boiling point of 150 C or greater, a density of approx. 1.1 to 1.2 g/cm3, and increased expansion with increasing temperature. The results were published in Soviet science journals, and short summaries were published in Chemical Abstracts in English, but Western scientists took no notice of the work.
In 1966, Derjaguin travelled to England for the "Discussions of the Faraday Society" in Nottingham. There he presented the work again, and this time English scientists took note of what he referred to as anomalous water. English scientists then started researching the effect as well, and by 1968 it was also under study in the United States.
A scientific furor followed. Some experimentalists were able to reproduce Derjaguin's findings, while others failed. Several theories were advanced to explain the phenomenon. Some proposed that it was the cause for increasing resistance on trans-Atlantic phone cables, while others predicted that if polywater were to contact ordinary water, it would convert that water into polywater, echoing the doomsday scenario in Kurt Vonnegut's novel Cat's Cradle.
During this time several people questioned the authenticity of what had come to be known in the West as polywater. The main concern was contamination of the water, but the papers went to great lengths to note the care taken to avoid this. However, Denis Rousseau of Bell Labs undertook to experiment with his own sweat after playing a handball game at the lab, and found it had identical properties. He then published a paper suggesting that polywater was nothing more than water with small amounts of biological impurities.
Another wave of research followed, this time more tightly controlled. Invariably the polywater could no longer be made. Chemical analysis invariably found that samples of polywater were contaminated with other substances (explaining the changes in melting and boiling points), and examination of polywater via electron microscopy showed that it also contained small particles of various solids from silicon to phospholipids, explaining its greater viscosity.
When the experiments that had produced polywater were repeated with thoroughly cleaned glassware, the anomalous properties of the resulting water vanished, and even the scientists who had originally advanced the case for polywater agreed that it did not exist. This took a few years longer in the Soviet Union, where scientists still clung to the idea.
Denis Rousseau used polywater as a classic example of pathological science, and has since written on other examples as well.

# In fiction
Polywater made appearances in the Star Trek science fiction universe, first appearing in the original series episode "The Naked Time" and then in The Next Generation episode "The Naked Now".
In its Star Trek appearances, polywater formed under certain extreme gravimetric conditions - such as the breakup of a planet or the collapse of a red supergiant star into a white dwarf.  When introduced into the systems of humanoids, polywater intoxication could occur if the polywater acquired carbon from the body, acting on the brain in ways similar to extreme alcohol intoxication.  It could also interact with Soong type androids with positronic brains, having affected Data during the polywater contamination of 2364. This polywater intoxication was known within the series as the Psi 2000 virus (in truth, not strictly a virus), named after the planet where it was first discovered.
The story "Polywater Doodle" by Howard L. Myers appeared in the February, 1971 issue of Analog Science Fiction/Science Fact.