This is the century for visual communication: video conferencing, YouTube, smart phones – and deaf people are at the forefront. We're getting geeky at the world's first and only deaf university, Gallaudet University in Washington DC. Scientific surprises too: could the genes that contribute to deafness have paradoxical benefits?   The final of  three programmes in an ABC  ‘All In The Mind’ feature series presented by Natasha Mitchell   (ABC, Part 3 of 3)

See the ABC website for this programme