Hogwarts he is detected using magic in the presence of Muggles, a serious offence among the wizarding community. Dumbledore argued in Harry's defence, stating that it was done in self-defence, and that the Ministry has no authority to expel students – such powers are invested in the Headmaster and the Board of Governors. Snape has attempted to have Harry expelled, and he attempted to have Harry's father, James Potter, expelled when they were at Hogwarts together. The only student known to have been expelled is Hagrid, for the murder of Myrtle with an acromantula believed to be the Monster of Slytherin
Necessity is the mother of invention of futile dodges" is much nearer to the truth." Necessity is the mother of invention "Necessity is the mother of invention" is an English-language proverb. It means, roughly, that the primary driving force for most new inventions is a need. "When the need for something becomes imperative, you are forced to find ways of getting or achieving it." The author of this proverb is unknown. This phrase was familiar in England, but in Latin, not in English. In 1519, the headmaster of Winchester and Eton, William Horman, used the Latin phrase "Mater artium necessitas" in his book "Vulgaria". In 1545