Pulley
A system using a rope and roller of some sort to allow people to pick up heavy items.
Utility
It is used to move heavy items, from rock and ore, to wood, and even moving furniture.
It can be used to destroy some things but that has to be done well.
Social Impact
It has allowed for less injuries, especially in the back from people trying to lift heavy objects.
Access & Availability
It has varied plans and designs, but is fairly well known to the world.
Complexity
It is not too complex and can be made with rope and some sort of roller object for the rope to go around.
Discovery
People were looking for ways to move heavy items and lift them into carts and wagons. People discovered rollers which helped move items.
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