The record drop in water pressure to date, a plunge of 26 pounds per square inch (PSI) of water pressure, came at the end of the TV showing of the movie "Airport." The movie "Patton" chalked up 22 and "The Good, The Bad and The Ugly" checked in with a respectable 19.

Carl Gustav Jung, the Swiss psychologist, elaborated the theory that the solution to a difficult problem can somehow suddenly crystallize in the unconscious mind.

A compelling example in favour of this theory concerns an engineer, David Bigelow Parkinson. The time was spring, 1940 and Parkinson was then a young engineer working at Bell Telephone Laboratories in New York City in the specialized field of electromechanical design. He was working on improving an instrument called an automatic level recorder. A small potentiometer [an instrument for measuring electromotive forces] controlled a pair of magnetic clutches which in turn controlled a pen to plot a logarithm.

Meanwhile, the top story in the headlines concerned the evacuation of hundreds of thousands of stranded Allied soldiers from the beaches of Dunkirk, France across the Channel to England. This news greatly preoccupied Parkinson's mind along with that of his work. And the two ideas came together in a dream, which he later described in an unpublished memoir:

I found myself in a gun pit or revetment with an anti-aircraft gun crew . [A] gun there. was firing occasionally, and the impressive thing was that every shot brought down an airplane! After three or four shots one of the men in the crew smiled at me and beckoned me to come closer to the gun. When I drew near he pointed to the exposed end of the left trunnion. Mounted there was the control potentiometer of my level recorder!

Parkinson realized the full significance of his dream the following morning. If his potentiometer could control the pen on the recorder, something similar could, with the right engineering, control an anti-aircraft gun. At the time, the complex mechanical systems controlling these guns were not very accurate and could not be mass-produced.

Parkinson discussed the idea that morning with his boss, Clarence A. Lovell. They worked for several days writing a report and then met with Lovell's boss. Just before this meeting, on 18 June 1940, Parkinson realized he would need a diagram to explain his ideas so made a quick sketch on a sheet of plain white typingpaper.

The company submitted a proposal for exploratory work on an electromechanical system for directing antiaircraft guns to the Army Signal Corps which was subsequently approved. An engineering model was delivered for testing to the Army at Fort Monroe MD on 1 December 1941. The result of Parkinson's dream began rolling off the assembly lines early in 1943. More than 3000 of the gun directors, designated the M-9, were built.

Many thousands of shells were fired to bring down a single aircraft with the older directors; the M9 brought the number down to around 100 shells per hit on an aircraft.

Thus Parkinson's unconscious revelation led to one of the most effective pieces of air-defense technology in World War II.

An even more striking example of the way in which food taboos can hamper good nutrition, even among so-called scientifically advanced people, also occurred during the war years in Great Britain.

At that time large amounts of human blood were collected from such people as were prepared to give it. The blood was centrifuged, the plasma put aside for parenteral injection into those victims of bombing that might need it, and the red corpuscles discarded.

Again the scientific advisers to the minister of food put forward a scheme to make use of the red-blood corpuscles, so self-sacrificingly contributed by patriotic donors, and manufacture from it black pudding for distribution on the food ration.

The curious anthropological phenomenon then emerged that although the British were prepared to consume each other's blood by vein, they considred its ingestion by mouth was a variant of cannibalism and therefore disgusting.