Scientists have long held that seven items—be they images, numbers, or tasks—was the best a brain could manage to hold at once, but LiveScience points out that, without specific practice, the best-case scenario for most people is three or four. It's a good explanation why phone numbers are written and spoken as three and four-digit groups, and a better reminder that if you've got a lot to do or remember, writing it down is probably the only way to hit 100 percent. What's your personal limit on non-practiced memory? How do you break up tasks and must-remember items into small groups for better recall? Share your successes in the comments, and check out our top 10 memory hacks for some pointers on augmenting your grey matter's somewhat paltry RAM.