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Electronic devices have been shrinking for years, but you might be forgiven for thinking that one that's only a centimetre across would be just too difficult to operate.

Now tests of a prototype device only slightly larger than this have shown that it can be made perfectly usable by combining a screen on the front with a touch-sensitive pad on the back.

Touch screens can be an intuitive method of interacting with computers and are now near ubiquitous in smartphones and other high-end hand-held gadgets.

http://www.newscientist.com/article/dn16295-fat-fingers-no-problem-with-seethrough-touchscreen-.html