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I would argue that the invention (or discovery) of lenses is one of the most important milestones in science and technology ever. It not only gave us cameras and projectors, but eyeglasses (imagine the early times for humans, not being able to see very well and no way to correct it), microscopes (allowing us to peer into the smallest of worlds) and telescopes (which ultimately led us to a better understanding of our solar system and indeed the universe).
Physics with Professor Matt Anderson