Braille was invented in 1824 by a 15-year-old boy named Louis Braille. His original system is still the one used today, although it has expanded with the expansion of basic vocabulary. Braille is used universally around the world as a means of reading for the blind.
Popsicles were invented in 1905 by Frank Epperson. He was 11-years-old at the time, and he invented them by mistake. He had left a drink sitting outside overnight with a straw in it. The temperature dropped below freezing during the night, and in the morning, Epperson discovered his frozen treat. He originally named them Epsicles, which was later changed to Popsicle.
The trampoline was invented by a 16-year-old boy. George Nissen invented the trampoline in 1930 in his parents' garage. He collected his materials from a local junkyard. The first trampoline had a rectangle steel frame with canvas stretched over it. Since then, the trampoline has been updated to be more durable and safe.
Glo-Sheets were invented in 1974 by 14-year-old Rebecca Shroeder. Glo-Sheets allow you to read information in the dark. Although not often used by the average person, they are widely used by doctors in hospitals. They also are used in the armed forces and by astronauts in space when they have to power down the space shuttle.
The Kiddie Stool was invented in 1992 by Jeanie Low. Low was 11-years-old at the time. The Kiddie Stool is a stool for the bathroom, which folds up and fits under the sink. It allows young children to unfold the stool, wash their hands in the sink, and then fold the stool back up to store it under the sink.