What did Charles Drew invent?

Charles Drew was an African-American doctor responsible for discovering crucial techniques for the storage of blood to be used for future transfusions. His work led to the widespread use of blood banks.

Charles Drew attended Columbia University in New York City, where he studied the properties of blood for the use of transfusions. He discovered that the separation of red blood cells and plasma allowed for the substances to be frozen and preserved, allowing them to be used for transfusion when needed.

He was also the founder and director of the American Red Cross blood bank and blood drive called Blood For Britain, which was intended to provide blood supplies to British troops during World War II.