Admittedly, when I first heard about the Gillette Labs Heated Razor, I was skeptical. I wasn’t sure how adding heat to a cartridge razor would make it better or if it would really work at all.

Here's the story of how the famed investor's razor wager led to him buying the battery maker. Betting on blades Buffett's Berkshire Hathaway conglomerate scooped up $600 million of Gillette's ...