Mobile VR is already here, and will grow fast

Samsung Gear VR was the first VR headset that Oculus, acquired by Facebook, actually launched. It's surprisingly good, and yet it's really just a very well-designed $100 headset accessory that runs off a phone, which acts as the 3D screen. That experience -- mobile, simple, and impressively visceral -- will define virtual reality for a while. It's low-priced, and easy to use. It's only real downside is that it only works with a handful of Samsung Galaxy phones.