The irrigation and canal systems in Bihar were primarily developed during the British Colonial Period to facilitate agricultural development and water management.

Bihar is a major coal-producing state in India, with significant reserves in the southern coal belt, contributing substantially to India's coal production.

According to Buddhist tradition, Siddhartha Gautama attained enlightenment and became Buddha while meditating under the Bodhi Tree at Bodh Gaya in Bihar.

Calculation: 63.8% - 47% = 16.8 percentage points. This represents the increase in literacy rate over the decade from 2001 to 2011 in Bihar.

Bahadur Shah Zafar, the last Mughal emperor, was imprisoned and later exiled to Rangoon after the Revolt of 1857. His life ended in exile, representing the end of Mughal rule.

Champaran Satyagraha was Gandhi's first major civil disobedience campaign in India, conducted in Champaran, Bihar, to protest the exploitation of indigo farmers by British planters.

The Grand Trunk Road, constructed by Sher Shah Suri during the Mughal period, passes through Patna, one of the major cities in Bihar, connecting North and South India.

Bihar, particularly through Buddhist monasteries at Nalanda, was instrumental in transmitting martial and philosophical teachings that influenced martial arts traditions across Asia through Buddhist monks like Bodhidharma.

Bhagat Singh, though born in Punjab, conducted significant revolutionary activities in Bihar and is revered as a martyr. He was executed on March 23, 1931, along with Rajguru and Sukhdev. He is commonly referred to as 'Shaheed-e-Azam' meaning 'Great Martyr' in Indian freedom struggle.

Nalanda University, located in Bihar, was one of the world's oldest universities established around the 5th century CE and was a center of learning for Buddhist scholars.