Calculate the number 542
NUMBERMANIA: Calculate the number 542 using numbers [3, 9, 9, 6, 94, 390] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.Correct answers: 1
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Polio vaccineIn 1961, the American Medical Association backed the Sabin polio vaccine over the Salk vaccine. In 1957, in an effort to improve upon the killed Salk vaccine, Albert Bruce Sabin began testing a live, oral form of vaccine in which the infectious part of the virus was inactivated (attenuated). This vaccine became available for use in 1963. The Sabin oral vaccine is often administered on a sugar cube. The advantages of a live, oral vaccine are its long-lasting immunity, and the lower cost because sterile syringes and needles are not necessary. A major disadvantage is that it cannot be used for patients with compromised immune systems because it is a live virus and can cause disease in these patients. |