In Stokes flow, Purcell's scallop theorem forbids objects with time-reversible (reciprocal) swimming strokes from moving. the presence of inertia, this restriction is eased and reciprocally deforming bodies can swim. A number recent works have investigated dimer models that swim at intermediate Reynolds numbers ${\textit Re} \approx 1$ –1000. These show interesting results (e.g. switches direct...