In the Technology Review section on nanotech this week, there is an article about a "solution of nanoscopic iron oxide particles" that changes color in response to magnetic fields. Using variable, controlled magnetic fields, this liquid can be changed to any visible color. One of the practical applications mentioned is "as pixels in rewritable posters or other large displays."Think of all those bars that could change the cover price for entry in response to nightly attendance:
Empty? "No Cover!"
Packed? "Cover: $20... and deadly good looks."
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