अपने शुद्ध रूप में, हीरा निम्नलिखित में से किस भौतिक विशेषता को प्रदर्शित करता 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?