elivery, in addition to allowing viewers to call up shows on demand, will enable TV to be transformed into a two-way medium that lets users interact with programs. Home shopping networks, for example, will allow viewers to order products directly from the screen via touch-screen, remote control, or spoken commands. "Say you're watching Friends, and you want to buy that sweater Jennifer Aniston is wearing; you'll be able to hit a button and order it," says Barry. Online shopping itself will be a much different and more buyer-friendly experience in 2025. Rather than staring at TV pitchpersons or catalogue-like Web pages, Virtual reality technology will allow viewers to examine products from various angles, even in 3-D. Haptic interfaces, which provide tactile feed- back, will allow shoppers to touch and manipulate products as if they were actually examining the items inside a real-world store. Additionally, shoppers will not only be able to look at fashions but also see how they themselves would actually look wearing the items, thanks to stored personal 3-D images and dimension profiles. 2.3 WEARABLE COMPUTERS It seems hard to believe that today's mobile phones or PDAs will get any smaller, given the fact that many of today's models are small enough to fit into a shirt pocket. But by 2025, phone circuitry may be even smaller and cheap enough to be integrated into clothing, perhaps inside a button or even woven into the fabric itself. "I can't wait for the day when I have a device that's small enough to fit into my pocket, which isn't true for most PDAs today," says Wim Sweldens, algorithms research department director at Bell Labs in Murray Hill, New Jersey. In the Telecosmos, a convergence between mobile phones and PDAs is inevitable. By 2025, a converged phone-PDA would likely take the form of a wearable computer. Already widely used in industry to help repair technicians, inventory takers, and other workers who either can't or don't want to enter data into a handheld device, wearable computers will likely become