Synaesthesia is the association of memory with our senses. Dr Frank Staub of Yale University demonstrated that you can easily improve your memory when you link the things you want to remember with a memorable sight, sound, feeling, taste or smell. In one experiment, he wafted the aroma of sweet chocolate over a group of students who were preparing for an exam. On the day of the exam, he released the same aroma while the students were taking the exam. The result was that these students out-performed everyone else.