Stairs. Some people hates it and even prefer elevators. But come to think of it, if it wasn’t invented we are climbing through a pole or a rope or maybe we are just living in a bungalow-type structures.
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Stairs. Some people hates it and even prefer elevators. But come to think of it, if it wasn’t invented we are climbing through a pole or a rope or maybe we are just living in a bungalow-type structures.