Your car may not answer when you talk to it, but we've got four GPS devices that will. The latest, cutting-edge GPS devices not only guide you to destinations and show you traffic conditions, but also respond to voice commands. You can fit your car out like the Knight Industries Two Thousand with one of these devices. They'll help you get where you're going, but they won't make your car bulletproof.
Up for a challenge?
Put yourself to the real tech test by building your own virtual-reality headset with a few household items.