Why does crab grass do so well when ordinary grass struggles in late summer? Is this a phenomenon? Or is this based on a scientific principle? If so, what is it that causes crab grass to thrive in relation to the different type of plants?

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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.

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