Touch-sensitive screens have become an ever-present fact of modern life \u2014 in airports, at ATMs, at restaurants and even in some libraries. Shelton\u2019s Kyle Young developed a rotation device that exposes such screens to ultraviolet light, disinfecting them for the next user. Young, a junior at Shelton High School, was one of four district students to present their innovations at the March 27 Board of Education meeting. They and 10 other students from Shelton will compete in the statewide Invention Convention, scheduled for May 4. \u201cScreens are everywhere \u2014 and unfortunately, so are germs,\u201d Young said. \u201cMy system would guarantee a clean surface for each user.\u201d Young\u2019s Clean Screen device uses an echo sensor to determine when a customer completes his or her transaction. The screen is then rotated and momentarily exposed to ultraviolet light. This method of disinfection has been demonstrated by the National Institute of Medicine and the National Institute of Health to kill some particularly virulent strains of bacteria, ones that are more resilient than the bacteria typically found in public settings. Fourth-grader Kailey Hill was first up among the students who showcased inventions. Kailey\u2019s innovation was a specialized cushion called a Bum Bum Buddy that makes makes classroom learning more comfortable for long stretches of time \u2014 and thus can help students become more attentive to the subjects at hand. \u201cMy chair cushion system is customizable and I specifically designed it for elementary-school students,\u201d said Kailey, who attends Sunnyside Elementary. For further comfort, there\u2019s a built-in holder for a water bottle. Perry Hill sixth-grader Lucas Kellogg spends hours at a stretch in cold places, cheering as his brother plays hockey. In such a setting, he noticed that applause for players can be almost inaudible because spectators all wear gloves. \u201cPeople end up yelling a lot and they hurt their voices,\u201d Lucas said. Lucas developed a pair of wooden inserts called Cold Clappers that nest inside spectators\u2019 gloves, enabling them to clap loudly without removing their gloves \u2014 or shouting. \u201cI tested different types of wood and plastic, and the wood makes the loudest noise,\u201d Lucas added. Shelton Intermediate eight-grader Sena Ho developed an invention that tackles an especially thorny global dilemma: water purification. In less developed countries, people must use buckets to transport water from wells, streams and rivers to their homes. Besides being arduous, the water can be contaminated. Ho\u2019s invention \u2014 C the Purity \u2014 is a universal bucket lid that has a built-in ultraviolet light source. To test the invention, Ho used microscopic snails that would be the equivalent in size to bacteria. The unit did the trick. \u201cIt is designed to fit over any standard 10-gallon bucket,\u201d said Ho. The other students who will participate in the Invention Convention, and their inventions, are: \u2022 Will Zaccagnino, fourth-grade, Booth Hill School, who developed a Foodie Chute to help kids and the elderly feed their dogs the proper portion of food. \u2022 Owen Russell, fourth-grade, Elizabeth Shelton School: Helping Paws Wheelchair Hammock, which assists disabled people in holding animals. \u2022 Stephanie Sanborn, fourth-grade, Long Hill School: the Duo Divider to help people sleep comfortably in the same bed. \u2022 Michael Skeffington, fourth-grade, Mohegan School: E.Z. Lights, a dispensing and storage device for Christmas lights. \u2022 Elena Gasbarro, sixth-grade, Perry Hill: The Careful Candle, a safer, more convenient candle enhancement. \u2022 Alexander Baneat, sixth-grade, Perry Hill: Clean Car Cape, which protects car seats from sweat and moisture. \u2022 Kaitlyn Bergers, eighth-grade, Shelton Intermediate: Slide to Track Band, which helps people with diabetes easily track which finger they last used to test blood sugar. \u2022 Luke Sanborn, seventh-grade, Shelton Intermediate: Eyelet Enforcer, which reinforces holes on identification cards and prevents their loss. \u2022 David Ferrara, 12th-grade, Shelton High School:Sky Sugar, a biodegradable balloon. \u2022 Sanya Oak, ninth-grade, Shelton High: The Helping Hand, a 3D-printed prosthetic hand for adults.