What were Galvani’s experiments? Illustrate the process of cognition in physical science using the example of Galvani’s experiments.

Galvani, while dissecting the frog, found in its tissue short-term current pulses, called “animal electricity”. When the scalpel connects the spinal cord and the muscles of the legs, the latter of which contracted.
If the conductor consisted of two metals, then the contraction becomes more noticeable. He explained this phenomenon that nerves and machines represent
electrodes, and the conductor serves as a spark gap.
1 Observation of a (often accidental) physical phenomenon;
2 Attempt to repeat and study (conductor of experiments, research);
3 Putting forward a hypothesis (theoretical laws, postulates);
4 Proof of the hypothesis (theory).