Researchers developing prosthetic devices have recently discovered a way to . cure populations of the hiv/aids virus . grow new brain cells in patients with post-traumatic stress syndrome . fuse patients’ nerves to robotic limbs . attach artificial limbs to the bodies of injured veterans . 2. who resigned the presidency of egypt as a result of “arab spring” demonstrations? . bashar al-assad . hosni mubarak . muammar gaddafi . mohamed morsi . 3. compared with americans, who spend little more than 15 percent of their income on food, people in less developed countr