Answer:
Heart Surgery; 1952 by Floyd Lewis who reduced the temperature of the body in order to lessen the need for oxygen while he closed a how between the upper heart chambers of the atria.
Organ transplant; 1967, a surgeon from South Africa conducted the first transplant of the human heart.
More Vaccines was developed; polio, measles, rubella was developed in the 1950's and 60's, amniocentesis test to detect birth defects (spina bifida and Down Syndrome), advancement in birth control (design), and discovery of DNA.
Explanation:
