Bone marrow, rich in blood-forming and immune system cells, is the soft tissue that fills the spongy interiors of animal bones. Diseases of the marrow can interfere with red blood cell production, and a technique called bone marrow transplantation is used to infuse healthy bone marrow into a patient whose marrow is defective. A large needle inserted into the center of large bones harvests the donor marrow. How are the stem cells from the marrow harvest introduced into the recipient's body?
L. Frank Baum
Back in the day
Officially called the Ardennes Offensive, this major German counter-offensive on the Western Front during WWII was the largest land battle in US Army history. Hitler planned to split the Allied line, enabling the German army to capture Antwerp and trap four Allied armies, thus ensuring a victory. An American force that held out at Bastogne and an attack on the German salient from the north and south foiled Hitler's plans. What other events led to the failure of the German counter-offensive?
Born on a day like today
Catherine of Aragon was the first wife of King Henry VIII and queen consort of England. When, after 18 years of marriage, Catherine had not produced a surviving male heir, Henry resolved to divorce her and marry his mistress, Anne Boleyn. When the Pope refused his annulment request, Henry had Parliament pass the Act of Supremacy, repudiating Papal jurisdiction in England, making the king the head of the English church and beginning the English Reformation. Did Catherine accept the divorce?