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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.
Also, a lot of kids don't have the slightest idea of what the "save" icon in their apps represents. They just know it's the save icon because it's everywhere
To be fair though, many kids nowadays have never seen a save icon as autosave is now practically everywhere. For example take anything on an iPad or other touch device.