Sleep and exercise will make you smarter way more than doing brain puzzles

1. Sleep deprivation is just as harmful and hurts your productivity just exactly the same way going to work drunk would be
2. There is something that makes a really big dent in your intelligence, that has a lot more impact, and that is unfortunately physical exercise
3. Taking fast walks 5 times a week can make you smarter than doing…any ..puzzles

- From Kathy Sierra’s creating passionate users talk

She recently spoke at the Future of Web Apps Conference London 2008.