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
Pointed Sticks stick" might be more useful than defending against fresh fruit. They chose this name after discovering that their first six choices had all been taken. At the beginning of their career they were briefly known as "Ernie Dick and the Pointed Sticks". Pointed Sticks Pointed Sticks are a Canadian punk rock/new wave band from Vancouver. Originally active from 1978 to 1981, then reuniting to perform in July 2006 through to November 2012. After a three-year hiatus, Pointed Sticks returned to the stage in June 2015 for shows on Vancouver island as well as the July 11th Khatsahlano street party in