The Ganga Action Plan was launched in 1985 by the Indian government to clean the Ganga River. Bihar is significantly affected as the Ganga flows through the state, and several cities like Patna depend on it.

Mahatma Gandhi led the Champaran Satyagraha in 1917 against indigo planters in Champaran, Bihar. Though Gandhi was not from Bihar, this movement was conducted in Bihar and is a significant part of its freedom struggle history.

Vaishali district in Bihar is home to the ruins of the ancient Vaishali republic, one of the world's oldest republics. It was the capital of the Lichchavi clan and had a democratic form of governance.

Calculation: 1000 mm × 60% = 1000 × 0.60 = 600 mm. This represents the average monsoon rainfall in Bihar, which significantly impacts agriculture and water resources.

The Rajmahal Hills in Bihar are known for their scenic landscape along the Ganga River. However, the question might refer to the Rajgir hills (not Rajmahal), which are more important pilgrimages sites associated with Buddha.

The statue of Manjushree in Vaishali is one of the tallest statues in Bihar, standing approximately 22 meters high. It was constructed to commemorate the Buddhist heritage of the region.

Megasthenes, the Greek ambassador, wrote in his Indica about Pataliputra (modern Patna) being one of the greatest and most prosperous cities in the ancient world during the Mauryan period.

Bihar has 40 Lok Sabha constituencies, making it one of the states with significant representation in the Indian Parliament after Uttar Pradesh and Maharashtra.

The terracotta seals and artifacts found at Vaishali bear Brahmi script, which is one of the earliest writing systems used in ancient India during the pre-Mauryan and Mauryan periods.

Pataliputra was the capital of the Magadha kingdom during the Mauryan Empire under rulers like Chandragupta Maurya and Ashoka.