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The world you were born into no longer exists.
(lemmy.world)
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. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
At some point in the future, everyone who is currently alive, will be dead and the earth will be populated with people who do not exist yet.
Since I was born when my parent were in their late 30's. And my father was as well, so my paternal grandfather was born in the 1890's. When I was a kid he told me stories of his childhood. I was only 9 when he died, and at the time his stories were just that; stories. Now (I'm in my 50's) I wish I had asked him things about those times. He was born and grew up in a world (mostly) without electricity, and without cars, phones, etc.
He was someone from a totally different world, and I knew him.
Added later: He was born "only" 129 years ago, everyone alive then, is now dead.