Apparently, MIT claims to have invented- for lack of a better term- shrink ray technology. They claim it uses a simple laser and that hyperabsorbent gel you find in things like diapers.
https://www.cnn.com/2018/12/17/us/mit-nanosize-technology-trnd/index.html
https://www.cnn.com/2018/12/17/us/mit-nanosize-technology-trnd/index.html

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