Goodenough is making a physics pun with “Braga glass” that the interviewers don’t catch - there is a well known phenomenon in solid state physics called a Bragg glass

https://www.nature.com/articles/s41467-018-03267-z

https://www.nature.com/articles/35096534 also arXiv here (https://arxiv.org/abs/cond-mat/0110592)