Microsoft researchers have put a new twist on telling time, creating a digital wall clock with hands for each member of the family. Instead of numbers, the hands point to places — work, school, home — and can track a person's location to show where he or she is at any time. Not good for teenagers, perhaps, but something parents might find interesting. Don't expect to buy the clock in stores anytime soon. That invention, and hundreds of others, were on display yesterday at Microsoft's annual science fair of the most futuristic ideas from the company's research division. Microsoft Techfest, as it is called, is designed to expose employees to projects being developed in Redmond and Microsoft laboratories around the world. Employees have a hard time following who is working on what in such a large company, and Techfest tries to connect some and inspire others.