  This note gives the first example of a hyperbolic knot in the 3-sphere that
lacks a nonorientable essential spanning surface; this disproves the Strong
Neuwirth Conjecture formulated by Ozawa and Rubinstein. Moreover, this knot has
no even strict boundary slopes, disproving the Even Boundary Slope Conjecture
of the same authors. The proof is a rigorous calculation using Thurston's
spun-normal surfaces in the spirit of Haken's original normal surface
algorithms.
