Louis Braille 1809-1852

French inventor of the reading and writing system to assist people who are visually impaired. A £20 pound note has 3 groups of 4 raised dots at bottom left £10 note has 2 groups of 4 at top left. Never twigged this until heard information on the radio yesterday, World Braille Day 4th January. Everyday's a schoolday as they say.