Visit here to for more information about Louis Braille and here to learn more about his writing system. If you're really curious about Braille and its use around the world, World Braille Usage has much more detailed information. Once braille was invented, further inventions had to be created so people could write in braille. Learn more about the history of braille writing devices here. Today, screen readers help people with visual impairments to navigate and read online.

Charles Barbier came up with a creative answer to a battlefield communication problem. There are many challenges, and equally as many innovative solutions, to sending messages in a war. Visit here to learn more about the history of military communication. In the digital age, it is more difficult than ever to manage secret information, but people are always coming up with new ways to hide messages.