The January issue of MRS Bulletin provides an overview of the field of rigidity theory applied at the atomic scale, addressing the relationship between functionality and molecular rigidity. Basic phenomena associated with the onset of rigidity have been discovered, which has led to “smart glasses” with multiple functionalities and mechanical performances, for instance. Topological prediction and engineering of physical properties are enabling intelligent design of new disordered materials. Guidance from molecular rigidity is particularly helpful for developing improved and new functionality in the fields of glass science, civil engineering, electrical engineering, optoelectronics, and biology. The talks in this webinar expand on the articles presented in the MRS Bulletin issue.