The following video is part of our "Motley Fool Conversations" series, in which technology and media editor/analyst Andrew Tonner discusses topics across the investing world.

Well, that didn't take long. Remember how U.S. stock markets largely shook off their nerves about the future of Greece? Not anymore. Despite getting some positive housing news on the home front, fears about the future of Greece and the larger European Union have markets rattled once again today. Indeed, the Dow Jones Industrial Average is sharply in the red today, with several of its major components plummeting precipitously as well. Investors everywhere are clearly rattled, so listen on to exactly why stocks are ailing in our midday market update.

After recent strength, many investors may think General Electric is a buy, but we'll actually give you a few reasons why you should sell GE today. Whether you're a current GE shareholder or thinking about becoming one, it's worth learning about both the bear and bull cases for this stock. Read more here.

Andrew Tonner has no positions in the stocks mentioned above. The Motley Fool owns shares of Microsoft. Motley Fool newsletter services recommend Microsoft. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.