Detailed Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: A student of Johannes Muller, he began his career in the mid-nineteenth century, studying the connection between nerve fibers and cells and inventing the myograph to measure the speed of nerve impulses. His more lasting accomplishments were in the area of physics, where his work on magnetic fields and current led to Maxwell's development of the displacement current and he served as mentor to Planck. FTP, name this postulator of the electron and the conservation of energy.
A:
Science