Pointlike electrons and muons and the nature of neutrinos
  We show that the form factor of an electron or a muon is unity for the modulus of the momentum transfer away from the Hagedorn temperatures $T^{e}_0\sim m_e$ and $T^{\mu}_0\sim m_\mu$ and lower than the hadronic Hagedorn temperature $T^{\tiny{QCD}}_0\sim m_\pi$. The structure of the electron or the muon is resolved for momemtum transfers comparable to $T^{e,\mu}_0$. This is seen in scattering experiments performed in the 1950s, 1960s, and early 1970s to test the validity of QED. We interprete center-vortex loops with no self-intersection, occurring in the confining phases of each SU(2) gauge-theory factor, as {\sl Majorana} neutrinos. We offer a possible explanation for a contribution to $\Lambda_{\tiny{cosmo}}$ not generated by the so-far nonconfining, strongly interacting gauge theory SU(2)$_{\tiny{CMB}}$. 
Ralf Hofmann