  The many worlds interpretation of quantum mechanics (MWI) states that the
world we live in is just one among many parallel worlds. It is widely believed
that because of this commitment to parallel worlds, the MWI violates common
sense. Some go so far as to reject the MWI on this basis. This is despite its
myriad of advantages to physics (e.g. consistency with relativity theory,
mathematical simplicity, realism, determinism, etc.). Here, we make the case
that common sense in fact favors the MWI. We argue that causal explanations are
commonsensical only when they are local causal explanations. We present several
quantum mechanical experiments that seem to exhibit nonlocal "action at a
distance". Under the assumption that only one world exists, these experiments
seem immune to local causal explanation. However, we show that the MWI, by
taking all worlds together, can provide local causal explanations of the
experiments. The MWI therefore restores common sense to physical explanation.
