Yesterday I enjoyed looking up at the clear sky and the thin cirrus clouds high up in atmosphere. I'm always amazed when I think how cold it is up in the atmosphere allowing those ice crystals to survive. It's been hot and humid out here today. Yesterday's cirrus clouds were replaced by cumulus clouds, but I've been watching those clouds get darker and taller over the last couple of hours. I might be in for a rough day.

oh ok, I look up at the sky too and it be amazing just watching it

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the answer to your question is tooth decay.

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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.