Walmart stock pops on another strong quarter, while shares of Macy's and Tapestry both suffer double-digit losses. Ron Gross and Jason Moser analyze the current state of retail and share why they believe Nordstrom and Under Armour have genuine opportunities to improve their standing with investors. We discuss the latest with General Electric, NVIDIA, Darden Restaurants, Berkshire-Hathaway, and Hologic. Plus, Motley Fool co-founder David Gardner discuss when to sell, when to add to your winners, investing takeaways from his recent trip to China, and his upcoming investor presentation on August 20th. (For more information on David Gardner's investor presentation visit http://Blast.Fool.com.)  Get $50 off your first job post at www.LinkedIn.com/Fool.