In chapter 3, the book discusses how your sense of smell can play a role in retrieving memories. Research done by Rachel Herz at Brown University has shown that scents help to render memories as more emotional. It has also shown that familiar smells illicit more brain activity in emotional brain centers than nonfamiliar smells. I found this to be interesting because I am able to associate different scents with certain memories. It is sometimes hard to remember specific details about memories, but scents have a way of bringing back the emotions associated with them. This video explains how smells can trigger memories.