A little over a year ago, Google capped off its I/O developer conference keynote with a curious device: Cardboard, a cheap virtual reality viewer made primarily out of its namesake material, a pair of ...

Step 1: Cut part of the front or back off a cereal box. Get a grown-up to help you. Cut two-thirds of the way down, leaving the back and sides intact. Step 2: Take some of the excess cardboard you've ...