The best-known brands aren't always the most valuable. In a new ranking from Interbrand Design Forum Walmart comes in first, with its brand value estimated at $129.8 billion, followed by Best Buy, at $22 billion, and the Home Depot at $20.8 billion. Many household names - including Kroger, Macy's and Sears - don't even crack the top 50.

Our greatest challenges can be our greatest teachers—and harbor the most significant opportunities for growth. They change our thinking, behaviors, strategies and actions and, ultimately, reinforce our foundation for future growth.