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
You-Are-Loved Chalk Message Project suicide prevention awareness campaign for LGBTQ college students. The project continued annually each October until 2012. In May 2012, the Chalk Message Project became part of Active Minds' National Day Without Stigma program. The Chalk Message Project raised awareness about suicide prevention for LGBTQ college students According to the Trevor Project, (a 24/7 crisis intervention and suicide prevention lifeline) LGBTQ youth are four to eight times more likely to attempt suicide than heterosexual youth. While little research has been done on suicide among LGBTQ college students specifically, a 2010 study from Campus Pride suggested a "chilly" climate for America's LGBTQ