Keyword Suggestionsterrelle pryor
terrelle pryor salary
trella wissenberg rheinberg
trellakis hno duisburg
A terrella (Latin for "little earth") is a small magnetised model ball representing the Earth , that is thought to have been invented by the English physician William Gilbert while investigating magnetism, and further developed 300 years later by the Norwegian scientist and explorer Kristian Birkeland , while investigating the aurora .