The zero-width space (ZWSP) is a non-printing character used in computerized typesetting to indicate word boundaries to text processing systems when using scripts that do not use explicit spacing, or after characters (such as the slash) that are not followed by a visible space but after which there may nevertheless be a line break. Normally it isn't a visible separation, but it may expand in passages that are fully justified. In HTML pages this space can be used as a potential line-break in long words as a replacement for the non-standard tag. However, it is not supported in all web browse...

Tetrahydrocannabinol ( ) (THC), also known as delta-9-tetrahydrocannabinol (Δ9-THC), Δ1-THC (using an older chemical nomenclature), or dronabinol, is the main psychoactive substance found in the cannabis plant. It was first isolated by Yechiel Gaoni and Raphael Mechoulam from the Weizmann Institute of Science in Rehovot, Israel, in 1964. In pure form, it is a glassy solid when cold, and becomes viscous and sticky if warmed. An aromatic terpenoid, THC has a very low solubility in water, but good solubility in most organic solvents. Like most pharmacologically-active secondary metabolit...

The cups and balls is a classic performance of magic with innumerable adaptations. The effect known as acetabula et calculi was performed by Roman conjurers as far back as two thousand years ago. One popularly circulated painting of two men holding two inverted cups over two round objects has been taken by some as evidence that the effect dates back to Ancient Egypt, though experts now doubt that that is what the picture shows. Indeed the more commonly accepted view now is that the image depicts something rather more mundane: the baking of bread. The most widely performed version o...