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 and T-shirts Blood, Sweat and T-shirts Blood, Sweat and T-shirts is a British TV documentary series, broadcast in 2008 on BBC Three. The series followed six British fashion consumers aged between 20 and 24 as they travelled to India to live and work alongside Indian garment workers, making clothes destined for sale in British high-street stores. The series was nominated in the Best Factual Series category at the 2009 BAFTA Television Awards. The series was followed by "Blood, Sweat and Takeaways" in 2009, which focused on the food production in Asia, and "Blood, Sweat and Luxuries" in 2010, which focused on the