Arunachalam Muruganantham's invention came at great personal cost - he nearly lost his family, his money and his place in society. But he kept his sense of humor. "It all started with my wife," he says. In 1998 he was newly married and his world revolved around his wife, Shanthi, and his widowed mother. One day he saw Shanthi was hiding something from him. He was shocked to discover what it was - rags, "nasty cloths" which she used during menstruation. "I will be honest," says Muruganantham. "I would not even use it to clean my scooter." When he asked her why she didn't use sanitary pads, she pointed out that if she bought them for the women in the family, she wouldn't be able to afford to buy milk or run the household. Wanting to impress his young wife, Muruganantham went into town to buy her a sanitary pad. It was handed to him hurriedly, as if it were contraband. He weighed it in his hand and wondered why 10g (less than 0.5oz) of cotton, which at the time cost 10 paise (£0.001), should sell for 4 rupees (£0.04) - 40 times the price. He decided he could make them cheaper himself.