Context-sensitive advertising works

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DrGreg
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No sooner than someone mentions "vacuum solutions" in a thread, an ad for a vacuum solution appears! :smile:

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:smile: :smile: :smile: and they wonder why Google is taking over the world.
 
How long until we can get Android powered vacuum cleaners?
 

Thread 'Thank you to mentors, advisors and members'

I want to thank those members who interacted with me a couple of years ago in two Optics Forum threads. They were @Drakkith, @hutchphd, @Gleb1964, and @KAHR-Alpha. I had something I wanted the scientific community to know and slipped a new idea in against the rules. Thank you also to @berkeman for suggesting paths to meet with academia. Anyway, I finally got a paper on the same matter as discussed in those forum threads, the fat lens model, got it peer-reviewed, and IJRAP...
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Thread 'Thank you physics forums, 20 years later'

About 20 years ago, in my mid-30s (and with a BA in economics and a master's in business), I started taking night classes in physics hoping to eventually earn the science degree I'd always wanted but never pursued. I found physics forums and used it to ask questions I was unable to get answered from my textbooks or class lectures. Unfortunately, work and life got in the way and I never got further the freshman courses. Well, here it is 20 years later. I'm in my mid-50s now, and in a...
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