Bhagalpur is famous for its silk industry and is known as the 'Silk City of India.' It has a long tradition of silk weaving and production.

Emperor Ashoka of the Mauryan dynasty ruled from Pataliputra in Bihar. He spread Buddhism across Asia and left edicts carved on pillars throughout his empire.

Madhubani painting is a traditional folk art form originating from Madhubani district. It features intricate designs and vibrant colors, depicting mythological themes.

Calculation: Monsoon rainfall = 60% of 1200 mm = 0.60 × 1200 = 720 mm. This represents the monsoon contribution to the total annual rainfall.

Land for wheat = 30% of 50 = 0.30 × 50 = 15 hectares. Remaining land = 50 - 15 = 35 hectares. This remaining land can be used for other crops.

Modern Patna is built on the site of ancient Pataliputra, the great city of the Mauryan Empire. Patna retains many historical sites from this ancient period.

Nalanda University, one of the world's oldest universities (5th to 12th century CE), is located in Nalanda district. It was a major center for Buddhist learning and attracted scholars from across Asia.

Emperor Ashoka, after witnessing the bloodshed in the Kalinga War, renounced his throne and embraced Buddhism. He became a Buddhist monk and devoted himself to spreading Buddhism throughout his empire.

Vardhamana Mahavira (599-527 BCE), also known as Mahavira, was the founder and 24th Tirthankara of Jainism. He was born in Vaishali, Bihar, and preached the principles of non-violence and asceticism.

The Kosi River is historically called the 'Sorrow of Bihar' because of its devastating and unpredictable floods that have caused immense damage to the region's agricultural lands and settlements.