Eliza knows a little something about monkeys. This will become relevant in a moment. In about 2016, Almeling et al. published a paper that suggested aged Barbary macaques maintained interest in members of their own species while losing interest in novel non-social stimuli (eg toys or puzzles with food inside). I’d never come across the concept of a Graphical Abstract before, but here is the one for this paper. Graphic design is my passion. Source This is where Eliza—who knows a little som...