Even Warren Buffett makes some investment mistakes

We all make mistakes, some investments don't work like we hope, even Warren Buffett does not bat 1000.Change in Management at a Berkshire Unit Encounters Snags - NYTimes.com: "At NetJets, the returns have been disappointing — and lately the losses severe. Through his investment company, Berkshire Hathaway, he bought the private jet travel business, which caters to the affluent, for $725 million