Motley Fool CAPS (caps.fool.com) is a free service you can use to test your stock-picking prowess. You don’t have to risk any money in the market, but you will be scored for your performance. At the age of 8, David’s son Zack started picking stocks on CAPS, and now, nine years later, you may be surprised by how well he did. Today, a teenaged Zack is in the studio to review those picks, his reasons for making them, and the lessons learned growing up with a Rule-Breaking dad.