Two brothers from Bihar remove 'poison' from magnets: Children turn pale from arsenic, how the idea of purifying 1000 liters of water for 8 rupees came about.

Arsenic, a poison found in water, poses a cancer risk to 50 million people in Bihar. The discovery of arsenic dissolved in the groundwater stems from a school project by two brothers. They have created a machine that is saving thousands of lives. How does this water-based arsenic removal machine work without electricity and high costs? What is the story behind the creation of this machine? Why is arsenic dangerous? Let's hear from Arpit.