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The ancient automatic doors of Heron

We think of automatic doors as a fairly modern invention, but 2000 years ago the ancient Greek engineer and inventor Heron from Alexandria had built the first automatic doors. Heron was an authority on engineering, and his inventions were centuries old, even millennia ahead of their time. The aeolosphere, was essentially the first locomotive ever built, and was used as an automatic opening mechanism for doors in temples and theaters.

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