  The cosmological constant and the Higgs mass seem unnaturally small and
anthropically selected. We show that both can be efficiently scanned in Quantum
Field Theories with a large enough number of vacua controllable thanks to
approximated $\mathbb{Z}_2$ symmetries (even for Coleman-Weinberg potentials).
We find that vacuum decay in a landscape implies weaker bounds than previously
estimated. Special vacua where one light scalar is accidentally light avoid
catastrophic vacuum decay if its self-cubic is absent. This is what happens for
the Higgs doublet, thanks to gauge invariance. Yukawa couplings can be
efficiently scanned, as suggested by anthropic boundaries on light quark
masses. Finally, we suggest that the lack of predictivity of landscapes can be
mitigated if their probability distributions are non-Gaussian (possibly even
fractal).
