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If there’s one thing most of us can be certain of it’s this: that our observed, physical reality actually exists. Although there are always some philosophical assumptions behind this conclusion, it’s an assumption that isn’t contradicted by anything we’ve ever measured under any conditions: not with human senses, not with laboratory equipment, not with telescopes or observatories, not under the influence of nature alone nor with specific human intervention. Reality exists, and our scientific description of that reality came about precisely because those measurements, conducted anywhere or at any time, is consistent with that very description of reality itself.
But there had previously been a set of assumptions that came along with our notion of reality that are no longer universally agreed upon, and chief among them is that reality itself exists in a fashion that’s independent of the observer or measurer. In fact, two of the greatest advances of 20th-century science — relativity and quantum mechanics — specifically challenge our notion of objective reality, and rather point to a reality that cannot be disentangled from the act of observing it. Here’s the bizarre science of what we know, today, about the notion of objective reality.
Objective reality
Put simply, the big idea is that reality exists, and it exists in a fashion that’s independent of anyone or anything that monitors or observes reality.
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James' World 2 
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