A lipid panel is a blood test that measures fats and fatty substances used by your body. These fats ,called lipids, measure cholesterol, triglycerides, high-density lipoprotein ââgood cholesterol â- (HDL), and low-density lipoprotein- âbad cholesterolâ- (LDL). lipid panel is a blood test that measures fats and fatty substances used by your body. These fats ,called lipids, measure cholesterol, triglycerides, high-density lipoprotein ââgood cholesterol â- (HDL), and low-density lipoprotein- âbad cholesterolâ- (LDL).
Blackboards, also known as chalkboards, were originally made from sheets of slate, a fine grained metamorphic rock derived from clay.lackboards, also known as chalkboards, were originally made from sheets of slate, a fine grained metamorphic rock derived from clay.
Blackboard Chalk Isnât Chalk. Ubiquitous in many classrooms since the 19th century, chalk and chalkboards are familiar to most of us. White, powdery and prone to sticking to those surfaces where it is put (and just as easy to wipe away), chalk and its accompanying board are excellent instructional aids. Notably, however, most chalk today isnât technically chalk at all, but gypsum. Chalk and gypsum have both been mined since ancient times. Chalk (calcium carbonate) has been found in cave paintings that date back to 40,000 BC, while gypsum (calcium sulfate) has been used as a mortar for construction since the dawn of civilization, and is even found in the Egyptian pyramids.