Microsoft Corp. has invested nearly $14 billion in OpenAI, the massively-valued developer of ChatGPT, but the company last week said that DeepSeek R1, an open-source AI model, was available on its ...

There are many high-flying stocks out there right now benefiting from enormous trends. But it can be difficult to gauge whether they're just flash-in-the-pan companies or great long-term investments.

Warren Buffett wrote, "Your goal as an investor should simply be to purchase, at a rational price, a part interest in an easily understandable business whose earnings are virtually certain to be ...