Brian Scordato: To be successful, nearly every startup will need to solve a wedge problem for their customer. Wedges are a mental game; how far from your core product should you go? What strategic and what's sapping your precious time? If you're going to sell smoothies out of a food truck, should you first help people find parking in the city or build trust? Is that too far away from smoothies? Does that really solve a problem? Would that just be a different full-time job?