Comments tl;dr: Electric fields + special relativity = magnetic fields
This is 'relatively' unknown triumph of special relativity ;-)
"What led me more or less directly to the special theory of relativity was the conviction that the electromotive force acting on a body in motion in a magnetic field was nothing else but an electric field." - Albert Einstein
This is 'relatively' unknown triumph of special relativity ;-)
"What led me more or less directly to the special theory of relativity was the conviction that the electromotive force acting on a body in motion in a magnetic field was nothing else but an electric field." - Albert Einstein