Braille is a tactile writing system used by people who are blind or visually impaired. It is traditionally written with embossed paper. Braille users can read computer screens and other electronic supports thanks to refreshable braille displays. They can write braille with the original slate and stylus or type it on a braille writer, such as a portable braille notetaker or computer that prints with a braille embosser. 

Braille is named after its creator, Louis Braille, a Frenchman who lost his sight as a result of a childhood accident. In 1824, at age 15, he developed a code for the French alphabet as an improvement on night writing. He published his system, which subsequently included musical notation, in 1829. The second revision, published in 1837, was the first binary form of writing developed in the modern era. 

Braille characters are rectangular blocks called "cells" containing tiny bumps called "raised dots". The number and arrangement of these dots distinguish one character from another. Since the various braille alphabets originated as transcription codes for printed writing, the mappings (sets of character designations) vary from language to language. Furthermore, in English Braille there are three levels of encoding: Grade 1 – a letter-by-letter transcription used for basic literacy; Grade 2 – an addition of abbreviations and contractions; and Grade 3 – various non-standardized personal shorthands.

Answer this series of questions:

1. Who came up with Braille?
2. Is it named for him?
3. When was he trying to make night writing better?
4. What did his code represent?
5. How old was he then?
6. What was published in 1937?
7. What about in 1837
8. Was this the first form of something?
9. During what period?
10. Who is braille meant for

Numbered answers:
1. Louis Braille
2. Yes
3. 1824
4. the French alphabet
5. 15
6. unknown
7. second revision
8. binary form of writing
9. modern era
10. blind or visually impaired