A mistake as to a fact essential to the agreement, common to both the parties (e.g., both bank and borrower are unaware that the mortgaged property was destroyed by fire before the execution of the deed), renders the resulting contract:

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?