Tag Archives: Invisible

Human eye can see ‘invisible’ infrared light under certain conditions: study

For the first time, researchers found that under certain conditions, human eye can sense “invisible” infra-red light. Using cells from the retinas of mice and people and powerful lasers that emit pulses of infra-red light, the research team found that when laser light pulses rapidly, light-sensing cells in the retina sometimes get a double hit of infrared energy. When that happens, ...

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Invisible ‘fingerprints’ to write obituary of fake currency?

Fake currency and counterfeit credit cards that often invade the markets may soon become things of the past if newly-developed invisible “fingerprints” — tiny tags made of silver nanowires — stand the test of time. The silver nanowires could form a unique pattern when randomly scattered, making it extremely difficult, if not impossible, for reproducing the objects. These invisible anti-counterfeiting ...

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