MerakSpielman said:
We can deduce a lot from the trace evidence we have found, but that doesn't mean we're right.
Like I said, it's impossible to quantify the amount we don't know. For example, we have found fossil evidence for thousands of species of dinosaur. This data can never tell us how many species left no fossil record because their natural environment was not conducive to the formation of fossils. We jump to conclusions all the time. If we find an herbavore with the remains of several predators, we deduce the predators must hunt in packs. For all we know, the predators were scavanging and fighting with each other over the remains. Perhaps all the animals were fleeing a larger animal or a forest fire, and simply injured each other in the course of trying to escape. There could be dozens of reasons for the find other than the conclusion they arrive at. We should not be too confident in our own abilities to deduce.
Imagine humanity 30,000 years ago.
How sophisticated was verbal language? How elaborate was the social structure? When did we begin giving names to individuals? Did religious beliefs vary greatly between different groups? Were there few enough resourses to fight over (i.e, was there warfare)? Did most groups migrate over a set pattern or just pick a direction and go? How did they decide which way to go? Was there agriculture (It is perfectly possible that agriculture was discovered and lost multiple times over the millenia)? Was leadership heriditary? In what year did humans first develop a system of religion/spirituality/mysticism? When did humans learn to swim? How many of these answers had significant variations between different groups of people, and how many were universal?
I assume a lot of you could make up answers to these questions, and there might even be a couple of questions up there that somebody can "deduce" the answer to, but really they can't be known with any degree of certainty. Somebody could probably answer all of these questions and sound very intellignent and thoughtful about doing it, but anything anybody says is little more than an educated guess, and is almost certainly wrong to some degree.
Again, all you're demonstrating is that our understanding of the past is incomplete. To which I think anyone would answer "well, duh."
Some things we do know about humanity 30,000 years ago:
They existed and had settled in parts of Europe, Southern Asia, Africa, and Australia.
They were anatomically very similar to us, and in many cases the individual characteristics of their skeletal remains lie in the range of variation of today's humans.
They had graphic, representational, and decorative art.
They hunted large game.
They at least sometimes buried their dead, often with distinct funerary practices.
They were capable of crossing open seas, presumably by boat, though since you deny the validity of such deductions, we can leave open the possibilities that they swam to Australia or flew over on helicopters.
They were capable of surviving in climates ranging from the equatorial to the sub-arctic.
They cared for their elderly and disabled.
They had functional stone tools.
Regional cultures had distinctive local toolkits, a peculiarity which was just beginning to appear at the time.