Fallout and controversy persist in Venezuela weeks after a national election. U.S. presidential candidates prepare to face off in Philadelphia. Pollution reaches record levels in a world-famous body of water. A challenging type of relay race takes place in the Austrian Dolomites. And dog owners, lovers and surfers gather in San Diego for a one-of-a-kind event. All of these stories and more are featured on today's edition of The World from A to Z!