THE Tanzanian twins who have made record for being the first 'astronauts' from Africa to fly to outer space and orbiting round Mars , the red planet , have just jetted back into the country. Sylvanus and Salvanus , who prefer to use the surname of 'Kawasange' their current guardian, are however , keeping mum about everything; " We shall grant you an interview after we have met the president, " they stated over the weekend in Ngorongoro District. Salvanus and Sylvanus will be special guests at the State House in Dar es Salaam this week when they meet President Jakaya Kikwete. The twins, born with extraordinary skills , said they will not be giving any official statement or interview and refused to take any photos prior to their meeting with the Head of State. The identical twins, in their early twenties are both geniuses . Their talents were discovered since childhood while at their home village of Arash in Loliondo Division of Ngorongoro District . With support from President Kikwete, the American Embassy and the United Nations , they both secured places at Havard University in the United States . It is difficult to tell them apart, but one is taking engineering while the other studies medicine. And sure enough, during their stay in Arusha the medical doctor performed eight different surgical operations at Karatu District Designated Hospital within a day. All the operations were successful . On the following day the surgeon did an equally successful head operation at Kilimanjaro Christian Medical Centre ( KCMC) in Moshi . The engineer reportedly can operate any piece of machinery after simply looking at it . He may not need its manual or directions . He can also take any complicated piece of technology apart and repair or reassemble it in a few minutes . Their involvement in the National Aeronautics and Space Administration (NASA)' s exploration of the red planet (Mars ) became an icing on the cake of their great achievements. The twins are a living evidence on how bright Tanzanian youths from humble backgrounds can shake the world with their extraordinary skills . Being monitored closely by the state , the twins who returned here for a two- week vacation and have been staying with Mr Bruno Kawasange, the Conservator for the Ngorongoro Conservation Area Authority so that they could be within their home area .