Acute leukemia happens when most of the abnormal blood cells don't mature and can't carry out normal functions. It can get bad very fast. Chronic leukemia happens when there are some immature cells, but others are normal and can work the way they should. It gets bad more slowly than acute forms do
“The key difference between braising and stewing,” he explains, “is the cut of meat. Braising is for cheaper, larger cuts of meat, such as beef cheeks. Stewing would use smaller cuts of meat that are uniform in size and it’s key to stewing that the meat is totally immersed in liquid. Both processes involve the lid being on the pot, which is also very important. Stewing would normally take place on the stove top and and braising would be typically transferred to the oven.” In case you were wondering, pot-roasting is another name for braising, he explains.
The answer for this question is ‘Epidemiology’