Vyasa is perhaps the greatest sage in the history of Hindu religion. He edited the four Vedas, wrote the 18 Puranas, the epic Mahabharata, and the Srimad Bhagavatam and even taught Dattatreya, who is regarded as the ‘Guru of Gurus.’ This little extract is from Srimad Bhagavatam and deals primarily with Druva's history.