Teachers at Pearce High School are used to seeing double - as they have ten sets of twins and one set of triplets in a year. The 16 and 17-year-olds from Richardson, Texas, USA, make up the largest year group of multiple-birth students in the world. Assistant Principal Chakosa Powell said: "There must have been something in the water here in Richardson 16 years ago. The possibility of so many families having twins the same year, even close to the same month, is amazing." The school hopes to be recognised by the Guinness Book of Records after beating a previous record of seven sets of twins held by a school in New York. Lessons at Pearce are overflowing with twins and several of the brothers and sisters compete against each other in different sports. Lindsey McKee, 16, is a cheerleader and regularly cheers on her twin Kelly, who plays basketball. Meanwhile Jessica and Rebecca Saucier are both members of the school running team.