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blindness Reference Libraries

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Braille
2010-09-23 19:56:17

The Braille system is a method that is widely used by blind people to read and write. It was devised in 1821 by Louis Braille, a blind Frenchman. The Braille characters are made up of six dot positions arranged in a rectangle containing two columns of three dots each. Including a subset when dots are not raised, there are sixty-four possible subsets. The positions on the grid are number 1-3...

Word of the Day
ecotone
  • A transitional zone between two communities containing the characteristic species of each.
The word 'ecotone' comes 'eco-' plus a Greek root meaning 'tension'.