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People born after 2000 have never seen the cosmic microwave background on their TV set.
(startrek.website)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. A showerthought should offer a unique perspective on an ordinary part of life.
I think they're more likely to have been scrapped than other old tech.
They're bulky, and mine was too heavy to get out in the attic. I still have my ZX Spectrum and Amiga, but the CRT needed for lightgun games is long gone.