Open Questions: Cognition

The Magical Number Seven: A seminal article on human cognition, by George A. Miller, originally published in 1956. The full title is "The Magical Number Seven, Plus or Minus Two: Some Limits on Our Capacity for Processing Information".
Finding Our Way: March 2005 Scientific American sidebar, subtitled "The human positioning system helps us navigate an unfamiliar city and may underlie general memory and thought."
Big Answers from Little People: September 2005 Scientific American sidebar, subtitled "In infants, Elizabeth Spelke finds fundamental insights into how men and women think."