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What’s an invention that quietly changed the world, but doesn’t get enough credit?

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Picklebobble2 · 56-60, M
The written word
GuidanceCounselor · 56-60, M
@Picklebobble2 which one
AthrillatheHunt · 51-55, M
@Picklebobble2 not every society invented the written word.
Picklebobble2 · 56-60, M
@GuidanceCounselor Any that gives expression to thought.