The Damodar River is called the 'Sorrow of Bengal' because it causes frequent floods in West Bengal and Bihar due to its unpredictable nature and heavy monsoon flows.

Patna is the capital of Bihar state. It is an ancient city located on the banks of the Ganges River and was known as Pataliputra in ancient times.

Nalanda University, located in Bihar, was one of the world's oldest universities and a center of Buddhist learning from the 5th to 12th centuries.

Bihar became a separate state on November 1, 1956, following the States Reorganisation Act of 1956. Before this, it was combined with Orissa as Bihar and Orissa.

Bodh Gaya is located in Gaya district and is where Gautama Buddha attained enlightenment under the Bodhi Tree.

Nalanda University, located in Bihar, was one of the world's oldest universities and the most prestigious center of Buddhist learning from the 5th to 12th century CE. It attracted scholars from China, Japan, Korea, and Southeast Asia.

The Bodhi Tree is located in Bodh Gaya, Bihar, where Buddha meditated and achieved enlightenment. The Mahabodhi Temple stands nearby and is a UNESCO World Heritage Site.

Calculation: 322 - 298 = 24 years. Chandragupta Maurya founded the Mauryan Empire and established his capital at Pataliputra (modern Patna), Bihar.

The Kosi River, originating in Nepal, is notorious for its unpredictable behavior and frequent floods, causing immense damage to Bihar. It has been called the 'Sorrow of Bihar' due to its devastating and recurring flood patterns.

According to the 2011 Census, Bihar's population was approximately 10.3 crores (103 million), making it one of the most populous states in India.