मोहनजोदड़ो की जल निकासी प्रणाली उल्लेखनीय थी क्योंकि प्रत्येक घर जुड़ा हुआ था:

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?