Human Sciences

http://brainz.org/ten-most-revealing-psych-experiments/
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The experiment Magic Number Seven: Plus or Minus Two, by George Miller, attempted to discover what were our limits on our capacity to process information. He recorded information from many small experiments that tested how well an individual could recognize a tone. Seven was the average of tones any individual could recognize with minimal error. George Miller theorized that this number represents the number of items we are able to hold in our short term memory at any given time. Recent studies have demonstrated that people are able to group items in short term memory, which is being able to hold more individual items, so even there the total if groupings are considered units, the number comes out to 7.
http://psychclassics.asu.edu/Miller/