When an experiment is repeated and the new results are different from the original results, what could you assume to be true?
a) the first set of results must be incorrect and thrown out.
b) the second set of results must be inaccurate and thrown out.
c) the experimental design must be flawed and should be scrapped.
d) the original experiment may be inaccurate and further experimentation is needed.

thinking it would be physical characteristics

about 40,000,000 results (0.81 seconds)  

search results

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.