Blood blood clotting in a transparent container. When blood is drawn in a glass container and left undisturbed for about an hour, four different layers can be seen. A dark clot forms at the bottom (the "black bile"). Above the clot is a layer of red blood cells (the "blood"). Above this is a whitish layer of white blood cells (the "phlegm"). The top layer is clear yellow serum (the "yellow bile"). The ABO blood group system was discovered in the year 1900 by Karl Landsteiner. Jan Janský is credited with the first classification of blood into the four types (A,
Blood, Sweat & Heels March 23, 2014, with a 90-minute reunion show. Brie Bythewood was dismissed from the series after the first season, and was replaced by two newcomers, Chantelle Fraser and Arzo Anwar. In April 2014, Bravo renewed "Blood, Sweat and Heels" for a second season, which premiered on March 29, 2015. On April 8, 2016, series star Daisy Lewellyn died after battling bile duct cancer. She was 36. She learned of the disease in 2015, after makeup artists noticed an unusual coloring in her eye. In the season two finale, she celebrated completing her radiation treatments. Blood, Sweat & Heels Blood, Sweat