CAMBRIDGE, MASS. — Here's what you need to know about Charles Simonyi: He made billions by inventing what later became Microsoft Word and Excel, he paid $25 million for a flight into space, and he's dating Martha Stewart. Oh, about that last bit? We wonder if Stewart knows about Simonyi's dinner plans. He's in Cambridge for Technology Review's EmTech conference, where, we hear, he's meeting with Victoria Gray. Gray is an event organizer and rumored to be an old flame of Simonyi's. Of course, perhaps the dinner conversation will be all business: Simonyi is reportedly an investor in a venture run by Gray. After the jump, a paparazzi snap of Gray by Valleywag intern Jordan Golson.