Abstract: A dreidel has a flasher that visually enhances the experience of play. The dreidel can include a rotatable body having four sides, the rotatable body including at least one flashing device; each of the four sides having a transparent or translucent window, each window being marked with a Hebrew letter selected from ?(Nun), ?(Gimel), ?(Hei), ?(Shin) or ?(Pei); and a handle protruding from the rotatable body, the handle being configured to turn the flashing device on and off.

Abstract: A method for removing VOCs from a gas stream comprising irradiating the gas stream in intimate contact with a semiconductor catalyst under laminar flow conditions. The catalyst can be chosen from a wide range of semiconductor materials, including naturally occurring chalcopyrites, synthetic chalcopyrites, CdTe, CdS, CuInSe.sub.2, CuS, FeS.sub.2, CuFeS.sub.2, Si, GaAs, GaSb, GaPS, ZnS, GaInP, and As.sub.2 S.sub.3. This process can be performed in a fluidized bed, in a tube reactor or in an irradiated reactor packed with catalyst adhering to a light conducting fibrous substrate. The method is capable of being practiced in a passive manner in a module have no moving parts and no requirement for routine maintenance or replenishment of reagents.