  We review the tau data-driven computation of Euclidean windows for the
hadronic vacuum polarization contribution to the muon anomalous magnetic moment
(a_mu), which agree with the lattice results, making the difference of the
$e^+e^-$ data-driven methods with them more intriguing. This conundrum needs to
be solved by next year, when the final FNAL a_mu measurement will be published,
in order to extract firm conclusions on possible new physics effects.
