Natural magnets are called "lode stones." The ancient Greeks knew about these, and about magnetism. Making iron bar magnets is a little trickier, but again, the knowledge dates back to antiquity, as compass needles are essentially light weight magnets, and have been used by sailors in navigation for centuries.
Nobody invented it, it is a natural process.
See the related question section below for a link to the answer of "Who discovered magnetism".
william gilbert
The magnetism of a quartz is 3.56
The Latin translation for Magnetism is Magnetismus.
repulsion is the real test for magnetism
Not magnetism, gravity.
There is the Currie point where magnets loose their magnetism.
magnetism magnetism magnetism
Permanent magnetism is magnetism that is permanent. I think...
what does magnetism been
Magnetism is a force not a solid.
The magnetism of a quartz is 3.56
Cheese has nothing to do with magnetism
Cheese has nothing to do with magnetism
there is no magnetism to an emerald
Paleomagnetism is the study of the magnetism of ancient rocks. In principle, it was the study of ancient magnetism
repulsion is the real test for magnetism
Not magnetism, gravity.
repulsion is the sure test of magnetism. Narahari.D