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TOKYO, JAPAN - JULY 01: (Back L-R) Japanese astronaut Mamoru Mohri, Executive Director for the Miraikan and speaker Osamu Suzuki pose for group photo during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602471 )

TOKYO, JAPAN - JULY 01: Feces models are displayed during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602193 )

TOKYO, JAPAN - JULY 01: Japanese astronaut Mamoru Mohri, Executive Director for the Miraikan speaks during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602167 )

TOKYO, JAPAN - JULY 01: An urine drainage pants is displayed during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602481 )

TOKYO, JAPAN - JULY 01: A cross section of moden toilet is displayed during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602213 )

TOKYO, JAPAN - JULY 01: Feces models are displayed during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602197 )

TOKYO, JAPAN - JULY 01: A children toilet sets are displayed during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602221 )

TOKYO, JAPAN - JULY 01: Speaker Osamu Suzuki speaks during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602431 )

TOKYO, JAPAN - JULY 01: Vistor touches the feces model during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602240 )

TOKYO, JAPAN - JULY 01: "Mark 5" a conceptual space toilet is displayed during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602284 )

TOKYO, JAPAN - JULY 01: A toilet is displayed during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602250 )

TOKYO, JAPAN - JULY 01: A giant toilet model is displayed during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602324 )

TOKYO, JAPAN - JULY 01: An old toilet is displayed during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602303 )

TOKYO, JAPAN - JULY 01: A toilet decorated with crystal rhinestones is displayed with during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602349 )

TOKYO, JAPAN - JULY 01: A gold toilet is displayed during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602338 )

TOKYO, JAPAN - JULY 01: A squat toilet is displayed during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602476 )

TOKYO, JAPAN - JULY 01: Many toilets displayed with cartoon faces are seen during the "Toilet!? Human Waste and Earth's Future" exhibition at The National Museum of Emerging Science and Innovation - Miraikan on July 1, 2014 in Tokyo, Japan. The exhibition focuses on how the toilet has changed our daily lives and discovers what the most environment-friendly and ideal toilet is. (Photo by Keith Tsuji/Getty Images) ( 80602356 )