Light Conversation

Harald Haas and his team from the University of Edinburgh have invented what he calls “speaking light”. In a TED talk on 15 July, Haas demonstrated the wireless transmission of HD video via a rapidly blinking desk lamp. The trick involves quickly modulating the intensity of “high-brightness” LEDs, allowing binary-encoded data to be sent to […]

A PC in Every Home and Wi-Fi in Every Window

When nobody’s fussing about Wi-Fi in schools and when there’s a lull between reports on the injurious effects of mobile phones I suspect few of us give much thought to the fizzing ocean of radio waves crashing over us silently, invisibly, continuously, ceaselessly. We take it for granted that the phone in our hand can […]