Your brain does not run on willpower alone. It runs on cues. Placing keys inside your shoes turns a routine object into a hard-to-miss memory prompt.According to research published in Memory and Cognition, environmental cues placed close to where an intended action happens significantly improve the chances of remembering to carry out that intention. Your shoes are the last thing you reach for before leaving. The keys being inside them makes forgetting nearly impossible. It Uses A Physical Object As A Memory Trigger