Zachary, a lab instructor, is writing a safety contract that his chemistry class will use for an experiment. He mentions that students should not eat or drink in the lab.

the supermassive black hole is in the middle of the galaxy.

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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.