An improved version of a technique for folding tiny objects from a thin membrane uses a magnetic field to affect the shape. The membrane wraps around a droplet of fluid that distorts in response to the field.
Phys. Rev. Focus28, 3 (2011) – Published July 18, 2011
The structures within a pile of soil or grain that allows it to bear weight depend only on the average number of neighbors for each particle, not on any details of the types of particles or even on the presence of gravity.
Dynamical heterogeneity, spatiotemporal fluctuations in local dynamical behavior, may explain the statistical mechanics of amorphous solids that are mechanically rigid but have a disordered structure similar to that of a dense liquid.