. >>> sufism, hansa mohammed reports from mogadishu. >> they are raising their voices once again, and want to be heard, sufis in mogadishu. they have been driven underground, their leaders killed or driven out of the cub. even the zed were not spared, more than a thousand sufi graves were december rated in the last -- desecratein the last decade. there is agreement, the security situation has been improving. >> the war in snal yah affected us. there are -- somalia affected united states. they celd the people and desecrated the graves of the dead ones. but thanks to god's mercy they are not here today. we have existinged before any group in somalia and we will remain here. >> reporter: al shabaab which is fighting to overthrow the government, deems them legitimate targets for attacks. while al shabaab fighters control large part of mogadishu, sufi mosques remaining empty. now the call for sufi to return is loud and clear. >> the youth must work hard to follow this path, the correct path. they should make time to return to their mosques and support their religion. that is our call to th

hansa mohammed, al jazeera, mogadishu. >> much more on the website, aljazeera.com. >> the frustration of a synthetic voice for those who computers? >> it sounds like a robot. >> researchers creating sounds that capture individual pers personality giving a face. >> what about your speech. >> my tongue. >> for those in need, new voice technologies that over the sweet sounds of success. >> it is funky. >> yeah. like you. >> this is "techknow" a show about innovations that can change lives. >> genetically modified food. >> we are going to restore the intersection of hardware and humanity, and we are doing it a new way. this is a show about science by scientists. "techknow" investigators giving voice to the voiceless. >> welcome to kechknow. i am phil torres. we meet someone knew, they will often make immediate decisions about who you are based upon your general appearance and what your face looks like and what you are wearing but, also, on the sounds of a your voice? >> it's true. there are tennessee of millions who can't speak or have limited speech. two and a half million of them are ri