मुख्य रूप से मानवीय भूलों, लापरवाही या उपकरणों के अनुचित समायोजन के कारण होने वाली माप त्रुटियों को किस रूप में वर्गीकृत किया जाता है?

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?