Fish swimming in groups can either conserve or expend energy during collective movement, depending on their spatial position within the school.

Fish in the thrust wake of a flapping foil reduce tail-beat frequencies, synchronize with oncoming vortices, and swim energetically more efficiently.

Fish schools showed an U-shaped metabolism-speed curve and reduced the energy use per tail beat up to 56% at high swimming speeds compared to solitary fish.

A hydrodynamic model of fish swimming in a channel predicts a critical flow speed for fish to successfully swim against a flow, unveiling a passive mechanism for rheotaxis to emerge without access to any sensory information.

Chemical receptors located on cilia can achieve particle capture rates that are many times higher than receptors located on a flat epithelial surface.

Spontaneous contractions allow shedding of the fluid boundary layer and thereby stabilize microbiota.

Prokaryotic and eukaryotic flagella follow a common trend in swimming cost-effectiveness, but eukaryotic flagella are too large for cells with prokaryote volumes, yielding insight into flagellar dissimilarity between taxa.

Confluent cellular layers display the remarkable ability of supportingmultiscale orientational order, that is the existence of different typeof liquid crystal order at different length scales.

A computational framework enables the inference of hydrodynamic continuum models for collective cell migration from live-cell imaging data recorded in zebrafish embryos.

Confined magnetotactic bacteria exhibit circling and U-turn trajectories explained by a competition of alignment with a magnetic field and alignment along the confining walls as well as considerable cell-to-cell heterogeneity.