The history of humans is unknowable. The history of SOME humans, might be a little bit knowable, but only superficially, such as on August first 1967 Joe got married.
And yet, 3 billion photos won't scratch the surface of the history of "a human."
This business of "history" is just a belief system built on stacked cards. It's nothing but intellectual gymnastics. The invention of recording history seems to have been the need to rationalize the actions of those whose actions are either most devastating, like generals, or those whose actions were most benevolent, like "saints." I'm not saying that lists of dates and names and places isn't legitimate as a chronology, I'm saying it doesn't convey meaning past that bookkeeping act.
If one reads a history of slavery, it will not possibly capture and review the incalculable human horrors of masses of people who are not masses really, but individuals with vast rooms of human emotion and experience and joy and pain. You can't collect that, and you can't distribute that to others for them to "understand" it's impact. Instead, we catalog the names of ships, their ports of call, their cargo in numbers, some of the names of captains or auctioneers and purchasers, and some anecdotes from the few slaves who had some opportunity to say something that was recorded. That's what we call history, and that's why it is impotent and ineffective as anything but intellectual fodder. That's why we can't learn from it, because it is an empty, highly decorated vessel. In much the same way, a photograph of a house, doesn't begin to tell the history of the house.