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Glass.
A few points from one of my favorite books:
  • Mirrors (played a role in enabling the renaissance, allowed people to see a clear reflection of themselves and reality)
  • Telescopes (enabled us to understand the cosmos and earth’s relationship to it)
  • Glasses (enabled most Europeans to read once the printing press was discovered)
  • Glass fibers (crucial for fiber-optic cables and the internet today)
  • Microscopes (enabling humans to study bacteria, and radically improve health standards)
  • And then all the obvious use cases like windows, device screens, skyscrapers