Jeff Bezos, Amazon.com founder and CEO, is now the second-richest person on the planet, besting Warren Buffett of Omaha-based investment conglomerate Berkshire Hathaway. Bezos' wealth climbed to $75.6 billion on Wednesday, according to the Bloomberg Billionaires Index. That tops Buffett's $74.9 billion and $74.2 billion estimated for Amancio Ortega,...