Blackboard ‘chalk’ are produced especially for use with blackboards in white and also in various colours. White chalk sticks are made mainly from calcium carbonate derived from mineral chalk rock or limestone, while colored or pastel chalks are made from calcium sulfate in its dihydrate form, CaSO·2HO, derived from gypsum. Chalk sticks containing calcium carbonate typically contain 40–60% of CaCO (calcite). As compared to whiteboards, blackboards still have a variety of advantages: On the other hand, chalk produces dust, the amount depending on the quality of chalk used. Some people find this uncomfortable or may be allergic to it, and according
Reese's Sticks "Reese's Sticks". They highly resemble Nutty Bars by McKee Foods. They are banned in Norway because of the use of genetically modified additives. Reese's Sticks Reese's Sticks, formerly called "ReeseSticks," are wafers filled with peanut butter and covered in milk chocolate. First introduced in 1998, they are manufactured by The Hershey Company and are currently still available. They are sold in pairs, similar to Twix and two finger Kit Kat bars. The fact that ReeseSticks digressed from the normal Reese's naming pattern was pointed out by Paul Lukas in his zine "Beer Frame". As Lukas noted, even though the official