  We report on sub-gap transport measurements of an InAs nanowire coupled to
niobium nitride leads at high magnetic fields. We observe a zero-bias anomaly
(ZBA) in the differential conductance of the nanowire for certain ranges of
magnetic field and chemical potential. The ZBA can oscillate in width with
either magnetic field or chemical potential; it can even split and reform. We
discuss how our results relate to recent predictions of hybridizing Majorana
fermions in semiconducting nanowires, while considering more mundane
explanations.
