when did blood transfusions become safer and why
Blood transfusion It was not until 1901, when the Austrian Karl Landsteiner discovered three human blood groups (O, A, and B), that blood transfusion was put onto a scientific basis and became safer.
Bloods The Bloods, also known as (OBF) Original Blood Family, are a primarily African-American street gang founded in Los Angeles, California. The gang is widely known for its rivalry with the Crips. They are identified by the red color worn by their members and by particular gang symbols, including distinctive hand signs.