A Beijing started using facial recognition to save toilet paper and stop . They scan people's and give 60 cm of toilet paper. You must wait for minutes if you want paper. Some park visitors took much toilet paper. The park put up asking visitors to use toilet paper.
There is a . The scanners are now a attraction. Visitors are coming to see them. Videos of people using them have gone on the . Staff help people need toilet paper. A social user said: "This is a really idea." The of toilet paper used is down by .