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Rods settling under gravity in a quiescent fluid can overcome the bottleneck associated with aggregation of equal-size spheres because they collide by virtue of their orientation-dependent settling velocity. We find the corresponding collision kernel Γrods=lβ1ΔρVrodg/(16Aμ), where l, A, and Vrod are the rods' length, aspect ratio (length divided by width), and volume, respectively, Δρ is the density difference between rods and fluid, μ is the fluid's dynamic viscosity, g is the gravitationaldoi:10.1073/pnas.1917163117 pmid:32015116 fatcat:j6xydrkc2zbtdigtaydgigmnie