World Toilet Day: 7 little known facts on nature's call

According to reports, nearly 4.5 billion people live without "safely managed sanitation" worldwide. And, more than 892 million people practice open defecation in which 678 million live in seven countries.

India takes the top spot with about 525 million people practising open defecation in the country. Here are seven lesser-known facts about "World Toilet Day."