The substance, which is derived from graphite, is stronger than diamond, more conductive than copper and more flexible than rubber.

BBC: Cambridge University opens ?25m wonder material centre

Graphene is far stronger than steel, more conductive than copper and more flexible than rubber so it could potentially open up entirely new avenues for manufacturing, consumer products and medical devices.

BBC: Europe gives 2bn euros to science

Most are simple designs, essentially a pen with a rubber tip that mimics the conductive property and shape of a fingertip. (Steer clear of styluses with fine, hard plastic tips, which are designed for older gadgets like the PalmPilot and won't work with today's touch screens).

WSJ: The Pen Is Mightier Than the Swipe