magnetic moment
... that the neutron has a magnetic moment even though it lacks an electric charge?
... that the <a href="./Neutron" id="mwBss" rel="mw:WikiLink" title="Neutron">neutron</a> has a <b id="mwBsw"><a href="./Nucleon_magnetic_moment" id="mwBs0" rel="mw:WikiLink" title="Nucleon magnetic moment">magnetic moment</a></b> even though it lacks an <a href="./Electric_charge" id="mwBs4" rel="mw:WikiLink" title="Electric charge">electric charge</a>?