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A set of plane Measure 0 that contains a Circle of every Radius.
References
Falconer, K. J.  The Geometry of Fractal Sets.  New York: Cambridge University Press, 1985.
 
Fejzic, H.  ``On Thin Sets of Circles.''  Amer. Math. Monthly 103, 582-585, 1996.
 
Kinney, J. R.  ``A Thin Set of Circles.''  Amer. Math. Monthly 75, 1077-1081, 1968.