There are people still alive from the 1800's

I wouldn't say that. Considering the exponential rate technology grows, I'm sure someone who lives 150 years from this point will see some incredible things.

Possibly a singularity or the colonization of another planet.

I'm not saying they won't see incredible things, but think of it in perspective... People that are alive now went from shitting in outhouses by candlelight and potentially dying from basic infections to seeing men living on a space station.

What could possibly be invented that would be such a dramatic jump? It would take things like cold fusion, faster than light travel and other sci fi fantasy type things to even come close to the jump in technology of the 20th and early 21st centuries.
 
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