What is the foil used for on the rear of this label?

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It's an RFID label similar to these:
1731168527395.png
 
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"Long Distance Passive Alien"... uh-oh! :eek:
 
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Thread 'RIP Chen Ning Yang (1922-2025)'

Thread 'RIP Chen Ning Yang (1922-2025)'

https://en.wikipedia.org/wiki/Yang_Chen-Ning ( photo from http://insti.physics.sunysb.edu/~yang/ ) https://www.nytimes.com/2025/10/18/science/chen-ning-yang-dead.html https://www.bbc.com/news/articles/cdxrzzk02plo https://www.cpr.cuhk.edu.hk/en/press/mourning-professor-yang-chen-ning/ https://www.stonybrook.edu/commcms/physics/about/awards_and_prizes/_nobel_and_breakthrough_prizes/_profiles/yangc https://www.stonybrook.edu/commcms/physics/people/_profiles/yangc...
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Thread 'In the early days of electricity, they didn't have wall plugs'

Thread 'In the early days of electricity, they didn't have wall plugs'

Hello scientists, engineers, etc. I have not had any questions for you recently, so have not participated here. I was scanning some material and ran across these 2 ads. I had posted them at another forum, and I thought you may be interested in them as well. History is fascinating stuff! Some houses may have had plugs, but many homes just screwed the appliance into the light socket overhead. Does anyone know when electric wall plugs were in widespread use? 1906 ad DDTJRAC Even big...
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