this post was submitted on 04 Oct 2025
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I'd give laser pointers to Neanderthals. Even if they did figure out some useful application for them (maybe hunting?) they'd run out of batteries eventually.

OQB @python@lemmy.world

top 12 comments
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[–] Jimbabwe@lemmy.world 3 points 52 minutes ago

Cool Ranch Doritos

[–] Adderbox76@lemmy.ca 3 points 1 hour ago

Furbies. Just to see if we end up with a furby based religion.

[–] snooggums@piefed.world 1 points 34 minutes ago

[Solar powered strobe lights.](https://www.amazon.com/Solar-Strobe-Warning-Light-Flashing
/dp/B08HLL8JQL)

Sure the battery will fail after a few years but until then they will have something that won't exist again for centuries.

[–] megane_kun@lemmy.zip 2 points 1 hour ago

If it's a civilization that hasn't yet had a writing system, a writing system.

However, I will teach them a (semi-)featural alphabet, kinda like if the Hangeul jamo were its own alphabet. It'd be fun how long the orthography will diverge from the spoken sounds, and how fossilized the orthography can be--and more interestingly, how they might evolve the writing system.

If it's a civilization that already is using a writing system, emojis that they can use alongside their writing system. It'd be interesting to see if they'd eventually turn into ideograms for human feelings and thoughts.

[–] fullsquare@awful.systems 4 points 2 hours ago

aluminum bars, they won't be able to work it into things like with iron. even if they do, they can't make more

[–] chunes@lemmy.world 5 points 2 hours ago

Nuclear bombs

[–] scytale@piefed.zip 4 points 2 hours ago

If we’re including eras where people are able to read and write, a history book. They will see their future and will attempt to change it, for better or for worse.

[–] Toes@ani.social 3 points 2 hours ago

Steam engines, clockwork and balloons. Hopefully they turn into a steampunk society.

[–] blave@lemmy.world 7 points 3 hours ago (1 children)
[–] buffing_lecturer@leminal.space 5 points 3 hours ago (1 children)

Talk about butterfly effect lol. I wonder where we would be today if antibiotics were readily available before plagues became plagues.

[–] blave@lemmy.world 3 points 2 hours ago

Me, too. That’s why I wanna do it!

[–] Zwuzelmaus@feddit.org 2 points 3 hours ago* (last edited 3 hours ago)

Kite & surfboard plus the appropriate colorful dress.

I'd show them once how it is done, then watch whatever happens.