On 4 January 1809, in a little French village called Coupvray, a baby named Louis Braille was born in his father's leather workshop. When Louis was three, he was playing with one of his dad's sharp tools and badly hurt one eye. An infection spread to the other, and by age five he could no longer see at all. But his parents refused to let him just sit in a corner. They made him a cane out of a cut stick, and Louis learned to race around the village by sound and memory.
At ten he won a place at a special school in Paris for blind children. The books there were enormous, with letters pressed up out of the page in raised shapes - heavy, slow, and almost impossible to read. Then a soldier visited the school and showed the boys a secret army code made of tiny raised dots that could be read in the dark. Louis loved it. He spent years simplifying it on his own, poking patterns into paper at night. By age fifteen, in 1824, he had finished a complete six-dot alphabet.
Louis Braille died at only 43, before his system was officially adopted. Yet today his dots cover lift buttons, medicine bottles, library books, and ATM keypads in nearly every country on Earth. Millions of blind and partially sighted people read, study, and write thanks to a code invented by a teenager who refused to stop reading just because he could not see.