Bill Gates believes that reinventing the toilet can not only save half a million lives, but it can also save $200 billion-plus annually in costs linked to diarrhea and other diseases caused by poor sanitation. Gates is so convinced that his foundation has already spent $200 million over the past seven years to create a novel toilet that can eliminate harmful pathogens and convert bodily waste into clean water, fertilizer, and even energy. Have a look here to see how Gates’ reinvented toilet could save money and lives all around the world.