Humans began to rapidly accumulate technological knowledge 600k years ago

The past 100 years of development are unfathomable already - even though some sci-fi from 100 years ago was accurate, so there was some imagination of what things could be like already. I like to believe I can vaguely predict what the next 100 years will bring, but that's based in a cynicism that the big scientific discoveries have been done already.

But 1000 or more years, unfathomable. It's the one reason where I wish time travel or suspended animation was real, just so I can see what the future might bring. Assuming it meanders on as it has for the past few thousand years, and there's no Great Filter event.