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With four parameters I can fit an elephant, and with five I can make him wiggle his trunk.

Attributed to John von Neumann by Enrico Fermi in "A meeting with Enrico Fermi" by Freeman Dyson in "Nature", Issue 427 (p. 297), www.nature.com. January 22, 2004.
With four parameters I can fit an elephant, and with five I can make him wiggle his trunk.