Most of the stuff in Jules Verne's books, even Paris in the Twentieth Century.
(Well, the moon gun would need to be a very long railgun, not a gunpowder cannon, if you want crewed capsules, but still.)
this post was submitted on 19 Jun 2025
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I would guess that we'll most-likely have AGI in 100 years. And that's pretty futuristic and impactful.
fusion maybe, but in scifi, it often requires an alien race making first contact, we wont even get to things like anti-matter tech without that intervention. SG1 is more in our time frame, but with aliens already possessing advanced tech
Orbital habitats with rotational gravity.
Underwater cities
With climate change and coastal flooding, it's coming, just not in the form you're thinking of.
You're implying venice ?
New Orleans circa Hurricane Katrina...?
Where I grew up, there was a town that had been intentionally flooded to make a reservoir, or so my parents told me; they claimed that when the reservoir was low, you could see the top of the church steeple. At the time, I drove past the area nearly daily and would often survey the waters, but never found anything that was likely to be more than shadows or a trick of the eye. At the time, I had barely learned of climate change and so wasn't worried about it; I just liked the idea of a structurally intact, intentionally flooded city.
I just looked it up to make sure I was remembering the details correctly. It turns out that either I misremembered or my parents exaggerated. The town apparently existed and was flooded, but at the time of flooding consisted of foundations and one very tall flagpole. Apparently it's a common pastime of kayakers and the like to look for the top of the flagpole. This is probably what my parents were referring to.
Still pretty cool, though.
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I'm hoping we'll get a couple of big medical breakthroughs on nuerodegenerative diseases and cancer in the same way HIV is now much more manageable than it once was.
The Oscilation Overthruster.
Robocop Bell Riots suppression?
I think genetic engineering is the most high-potential tech right now. They're already using it to cure sickle cell, and my (total non-expert, probably way too hopeful) pipe dream is that we could basically treat it like we can open a terminal on the body some day and change whatever we want.
Edit: I just want to point out that I'm imagining curing cancer, reversing aging, etc. Not like, additional orifices or anything.