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TechFirm's free iPad app enables people who can't use their fingers to tweet by selecting letters with breath power.
People who use Guger Technologies' Intendix wave speller will need oceans of patience if a CeBIT demo is any indication.
Scientists are working on a biomimetic chip called ReNaChip that could advance current treatments by making deep brain stimulation more precise.
Austria's Guger Technologies is billing the device as the world's first commercial personal brain-machine speller.