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 & 3 Years Blood, Sweat & 3 Years Blood, Sweat & 3 Years is the fourth studio album by American electronic music group Cash Cash, released on June 24, 2016 by Big Beat Records and Atlantic Records. It is their first full-length album since signing to Big Beat, following the release of the "Overtime" and "Lightning" EPs. "Blood, Sweat & 3 Years" includes collaborations with singers Anjulie, Bebe Rexha, Chrish, Christina Perri, Dev, Jacquie Lee, Jenna Andrews, John Rzeznik from the Goo Goo Dolls, Julia Michaels, Michael Fitzpatrick of Fitz and The Tantrums, Neon Hitch, and Sofia Reyes; rappers B.o.B, Busta Rhymes, Nelly,