Scientists are developing toilets that do not use water. Water is a limited resource, but each year 1.5 trillion gallons of clean drinking water are flushed down toilets in the United States.

Three promising types of waterless toilets are solar toilets, composting toilets, and bio-toilets. Each of these toilets recycle human waste into something useable.

Solar toilets burn up waste using the energy of the sun. Waste is cooked until it becomes a charcoal-like substance called “bio char,” which can be used as fertilizer. 

There is an amazing camp in Tucson for girls going into 5th, 6th, and
7th grades. It is called the Colors of Nature Academy, and it teaches
girls science through art. The camp is organized by researchers from the University of Alaska Fairbanks, the National Optical Astronomy Observatory in Tucson, and the University of Washington Bothell. The camp lasts two weeks and is actually a study funded by the National Science Foundation. The Colors of Nature Academy is held at the University of Arizona campus. There is no cost to attend the camp, but girls must apply.