This Windows tablet lets you use any metal object as a pen
 

Sure, pens on tablets are great -- until you misplace them. Even when there's a pen-hole built into the device, there's a good chance you'll either lose it at a coffee shop, or at the very least forget to pack it before leaving the house in the morni...

http://www.engadget.com/2015/01/05/l...=rss_truncated