(A) (a) An active particle with seven legs manufactured by rapid prototyping; (b) top view of the system with N=379 particles. (B) (a) Distribution of the rotational velocity of asymmetric Gaussian shape (solid lines); (b) velocity distribution function P(|v|). The dashed lines show the function predicted by kinetic theory of granular gases, P(v)~e^-3/2 (Adapted with permission from Ref. [90]. Copyright c 2017, American Physical Society).