US scientists have turned a sheet of paper into a cheap, lightweight and foldable electronic display.George Whitesides and colleagues at Harvard University, Cambridge, printed a message on one side of the paper and patterned the other side with conductive wires. They then sprayed a thermochromic (changes colour with temperature) dye over the message. When they passed an electrical current through the wires, the heat generated changed the dye from coloured to transparent, revealing the message underneath.
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