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Watch Cosmos A SpaceTime Odyssey Season 3 Episode 9 online. Maybe available on Youtube, Netflix, PrimeVideo, Hulu, Disney and other legal streaming platforms.

In the counterintuitive realm of quantum mechanics, light can be two contradictory things, and somehow — no one knows how — an unseen observer can alter the nature of reality. Meet the man who stumbled upon this hole in reality and the still-unfolding technological revolution that it made possible.