Writer Andrew Lipstein embarked on a quest to freak himself out about passive investments: Things like buying index funds, for instance all the companies in the S&P 500, setting it and forgetting it. Lipstein spent time with a professional investor who argues index funds play a dangerous role in the market that may not end well. We hear that story. But first, chipmaker Nvidia reports a seven-fold increase in profits. Our May fundraiser ends Friday, and we need your help to reach our goal. Give today and help fund public service journalism for all!