Accessibility and Innovation

Accessibility is a major driver of innovation and invention:

Braille Code, E-Mail, Headphone, Keyboard, Microphone, Personal Digital Assistant (PDA), Printer, Punchcard, Scanner/OCR, Speech Recognition, Speech Synthesis, Spectogram, Subtitling, Talking Books, Telephone, Teletype, Transistor, Voice Indexing, ...

Source: Accessibility and Disability - A History of Innovation by Artur Ortega, Yahoo!