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
Ship Sticks Ship Sticks Ship Sticks (Ship Sticks LLC), founded in 2011, Ship Sticks is a private company based in West Palm Beach, Florida. It was founded by Jonathan Marsico and Nicholas Coleman, its CEO. It offers a novelty service wherein customers' golf clubs, skis and other luggage are shipped to them at a desired destination. It allows scheduling of shipment dates, pickup and insurance: a $200 consequential insurance and $1000 loss insurance. Ship Sticks uses an online interface that enables the user to select from partner pre-loaded golf courses (such as Bandon Dunes, Grand del Mar or PGA National). This in