Google's DIY Cardboard-and-Smartphone Virtual Reality Headset

Google gave a gift to everyone who came to its developers conference this week: a kit to make a virtual reality headset out of folded cardboard and an Android smartphone. Virtual reality has lurched through several hype cycles over the past few decades, and we are smack in the middle of the latest one, inspired by Oculus VR, the headset maker that Facebook bought for $2 billion in March.

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