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Compiled by Roger Shlomo Harris Copyright © 2005

233 TRIVIA: An interesting feature of this container screw cap is its near-perfect dynamic balance. In the course of its manufacture a very small prominence is created at the exact centre of the outer surface. When the cap is inverted and spun on a hard smooth surface, e.g. Formica™ or sheet glass, it rotates on the prominence. A Bernoulli effect ensures that, except for the prominence, the cap does not contact its supporting surface. It is able to spin for more than 40 seconds. These Fold Farm-Charedi screw caps can thus out-spin any dreidl, both the standard Chanukah dreidls made of wood or clay and the technically advanced high-performance models. In an informal spin-off, a similar screw cap (DairyBelle™ milk, South African Beth Din) managed to spin for only about 37 seconds.	Authority: Kedassia, London, U.K. Source: Charedi Fresh Kosher Milk   1 Litre. (Fold Farm, Barnet, EN5 4RA, U.K.) Note: The spelling of 'Charedi' is as rendered on the label. Date: June 2002 Size: diameter = 40mm approx. Comment: The illustration is of the plastic screw cap of a milk container. The paper label on the side of the milk container bears the more familiar round Kedassia hechsher. Text details:
	כדתיא
	16 JUN [2002]

 

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