Elasticity typically refers to a material's ability to store energy, whereas viscosity refers to a
material's tendency to dissipate it. In this review, we discuss fluids and solids for which this is …

In active matter systems, individual constituents convert energy into non-conservative forces
or motion at the microscale, leading to morphological features and transport properties that …

Swarms, which stem from collective behaviors among individual elements, are commonly
seen in nature. Since two decades ago, scientists have been attempting to understand the …

From protein motifs to black holes, topological solitons are pervasive nonlinear excitations
that are robust and can be driven by external fields. So far, existing driving mechanisms all …

Active colloids use energy input at the particle level to propel persistent motion and direct
dynamic assemblies. We consider three types of colloids animated by chemical reactions …

The remarkable anatomical homeostasis exhibited by complex living organisms suggests
that they are inherently reprogrammable information-processing systems that offer …

Thermal chirality, generically referring to the handedness of heat flux, provides a significant
possibility for modern heat control. It may be realized with the thermal Hall effect yet at the …

When in equilibrium, thermal forces agitate molecules, which then diffuse, collide and bind
to form materials. However, the space of accessible structures in which micron-scale …

We review the literature on swimming in complex fluids. A classification is proposed by
comparing the length-and timescales of a swimmer with those of nearby obstacles …

Chiral active matter comprises particles which can self-propel and self-rotate. Examples
range from sperm cells and bacteria near walls to autophoretic L-shaped colloids. In this …