Cardboard Hits Half a Million Mark, Gets an SDK

PC Magazine reports (citing a blog post from project manager Andrew Nartker) that Google's Cardboard -- first introduced to some laughter -- is growing up, with a small but growing collection of compatible apps and a recently announced SDK. And while Cardboard itself is pretty low-tech (cardboard, rubber band, a magnet) and consequently cheap, the resulting VR experience is pretty good, which explains why more than 500,000 of them have now shipped.