Achildren’s hospital in a major american city reported a dramatic increase in the number of rheumatic fever cases. doctors were alerted to start monitoring sore throats more carefully. why do you suppose the prevention method was recommended?

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what do the different brain waves do?

explanation:

brainwaves are produced by synchronised electrical pulses from masses of neurons communicating with each other. brainwaves are detected using sensors placed on the scalp. brainwave speed is measured in hertz (cycles per second) and they are divided into bands delineating slow, moderate, and fast waves.