I will describe the final results from two sister experiments --
MuLan and MuCap -- conducted at at Paul Scherrer Institute (PSI)
in Switzerland. In the MuLan experiment the positive muon lifetime
was measured to +/-1.0 ppm precision and used to extract the Fermi
Constant G_F to +/-0.6 ppm. In the MuCap experiment the
muonic hydrogen atom lifetime was measured to +/-10 ppm precision
and used to extract the induced pseudoscalar coupling g_p of
the proton weak interaction to +/-7%. The results are
significant improvements in the experimental determination
of these fundamental constants and offer improved tests of
electroweak interactions (G_F) and QCD symmetries (g_p).
I will discuss our novel, low-energy, time-structured muon beam
at PSI, the experimental challenges of part-per-million lifetime
measurements, as well as presenting our final MuLan and MuCap results.