When were the different blood types discovered?
user
Blood types were discovered much later in human history than other features of blood, like oxygen-carrying capacity or clotting ability.  The first modern descriptions of blood types were published in 1900 by a Danish physician named Severing Koch.  However, blood types were extensively researched and classified in the following decades by a variety of scientists, including Karl Landsteiner, Alexis Carrel, and Francis Watson.  Landsteiner and Carrel both received Nobel Prizes in Physiology and Medicine for their work on this topic, and Theresa and Karl Landsteiner jointly received the Nobel Prize for their work analyzing the blood groups of different peoples and animals.  Shared human blood types are classified in many different ways, but the most typical classification scheme uses four categories: O+, A+, B+, and O-.
assistant
When were the different blood types discovered?
user
Blood types were discovered much later in human history than other features of blood, like oxygen-carrying capacity or clotting ability.  The first modern descriptions of blood types were published in 1900 by a Danish physician named Severing Koch.  However, blood types were extensively researched and classified in the following decades by a variety of scientists, including Karl Landsteiner, Alexis Carrel, and Francis Watson.  Landsteiner and Carrel both received Nobel Prizes in Physiology and Medicine for their work on this topic, and Theresa and Karl Landsteiner jointly received the Nobel Prize for their work analyzing the blood groups of different peoples and animals.  Shared human blood types are classified in many different ways, but the most typical classification scheme uses four categories: O+, A+, B+, and O-.
assistant
When were the different blood types discovered?