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Instrumentation and measurement

Instrumentation and measurement

Human hand used as an infrared source to reveal secret messages

18 Apr 2021
Photo of a human hand
Infrared sources: front and back of a human hand, which researchers in China have used to reveal a secret message. (Courtesy: Evan-Amos/CC BY-SA 3.0)
The human hand can be used as an infrared radiation (IR) source to decrypt hidden messages and regis

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Ian Randall is a science writer based in the UK
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