Wei Lii has recently constructed a proper rational parameterization for the two-sided offset to
a parabola - indicating that this locus, an irreducible curve of degree n = 6, is of genus 0. The
theory of algebraic curves then requires that the parabola offset have f (n - 1) (n - 2) = 10 double
points. One affine node and six affine cusps are readily identified by geometric arguments; we
show that the remaining three double points are accounted for by a non-ordinary double point at
infinity, having double points in its first and second neighborhoods.