… but I’ll present two of my own as well:
First, a mathematical analog!!!
You can use a certain form of metamaterial to send a wave representing a function and get the derivative coming out the other end!
http://www.upenn.edu/pennnews/news/penn-research-helps-lay-out-theory-metamaterials-act-analog-computer
Second, you can have a book with pages that rip off for purifying water!!!
Okay, I’m having trouble finding online stuff about the special book with tiny silver particles that can treat sewage.
— Meantime, here is something related:
Oh boy Oh boy Oh boy!!!
- Trans Fat Og, the ONE True Blue Jack!
Okay, I have come across two sites for the second application:
http://www.new scientist.c om/article/mg21829165.400-silver-nanoparticles-provide-clean-water-for-2-a-year.html#.U7MvZVczJFI
http://www.health line.c om/health-news/tech-gel-with-silver-nanoparticles-disinfects-water-082313
If you think anything approaches or exceeds these I’d like to know.
(Would this thread have fit better in a different forum?)