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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.
Opening line of Neuromancer doesn't make much sense any more "The sky above the port was the color of television, tuned to a dead channel.”
"The sky above the port was blue, with a grey rectangular box with writing saying 'No signal found.'"