It turns out that something has been watching the Earth in minute detail since before the solar system was formed, down to a sub molecular level. It can give you the answers to any historical questions, but not things like what someone was thinking or feeling.
All the world’s problems have been solved, and the information is only used with the strictest privacy, e.g. you can only get information on living people with their permission, or if you’re a member of law enforcement solving a crime.
The question is, if you have a hobby, job, or other reason to research the past, like being a geologist or genealogist, would you take the answers, or would you prefer to do the research yourself?
I read an Arthur C Clarke book a few years ago, and it was based around a device that could see anything, anywhere, some sort of microscopic portal I think. One of the characters used it to look back in time following someone’s DNA, so seeing their mother, then their mother’s mother and so on, and eventually saw the intelligence disappear from the distant ancestors eyes. I’m wording it badly, but the idea stuck with me.
I’d love to know when that first spark of intelligence showed up, that separated us from animals, and what our ancestors either side of that divide did differently and similarly. I doubt that there would have been any significant differences at first, but those subtle differences could be fascinating :)