Bill Gates announced launch of tiolet challenge . The new toilets will be showcased at a fair this year . This week the Bill & Melinda Gates Foundation announced who won the challenge . The challenge is part of an effort to improve worldwide sanitation . Lack of sanitation access is blamed for the deaths of 1.5 million children each year , experts say .
Bill Gates announced launch of tiolet challenge . The new toilets will be showcased at a fair this year . The challenge is part of an effort to improve worldwide sanitation . Lack of sanitation access is blamed for the deaths of 1.5 million children each year , experts say .