How can water be monitored to assure it is safe for human consumption?

By inspecting it under a microscope or boiling it to make sure no dangerous bacteria are inside.

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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.