Sanjay Gupta, MD: 4 Ways to Strengthen Your Memory

Squishy stress balls are great for working out your aggression, but they may also be useful for recalling something quickly. In a 2013 study, subjects squeezed a rubber ball in one hand and studied a list of words, then clenched the ball in the other hand and recalled the list. Those who used the right hand before memorizing and then used the left before recalling remembered more words than the group who did the opposite. The finding supports the idea that the brain's left hemisphere (activated when using your right hand) is responsible for storing certain memories, while the right retrieves information.