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Their use could cause a delay in counting votes because they cannot be read by optical scanners.
WSJ: Sandy Prompts Shifts in Voting Procedures
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Gov. Crist said he wants to get rid of all those touch-screen machines and replace them with optical scanning systems that would read paper ballots.
NPR: Florida Move Would Back Up Electronic Voting
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Scout now pulls your vitals in ten seconds using just optical sensors, which enables it to read the vital signs of others -- as opposed to the prototype which utilized an EEG sensor and could only record the info of the person holding it.
ENGADGET
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Nano bar codes are the molecular versions of traditional bar codes--metal nano-particles that have specific, recognizable chemical fingerprints that can be read by a machine, perhaps a UV lamp or optical microscope.
FORBES: Safer And Guilt-Free Nano Foods
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The team is already thinking of applications for metamaterials as read-heads for future generations of hard-disk drives or optical modulators for communications.
ECONOMIST: MONITOR