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Articles tagged with: silver

Pen That Can Doodle Live Circuits On Paper

Gel pens, beloved by middle-school kids, are good for doodling in class, and not much else. But if you replace that metallic ink with real silver, you get something quite remarkable: a pen that can draw functioning circuits on paper.

Engineers at the University of Illinois have built such a device and used it to put together several clever electronic doodads. Silver is a conductor, so it ferries electrons from a power source, like a battery, to an outlet, like an LED light, even when it’s just a line on a piece of paper instead of a wire.

New Dutch Coin Can Be Scanned

The Royal Dutch Mint has just produced a limited edition of QR coded coins to celebrate the 100th (centennial) anniversary of the Mint in Utrecht. The silver coin is worth 5 euros and the gold coin is worth 10 euros. Both coins will be issued this month, on June 22nd.

What makes these coins unique is that you can scan the code that is found on the back of each coin. Supposedly the code will provide information on where the coin was manufactured, and the scan currently points to this site.