Training is difficult in Kabul, but Afghanistan's only Paralympian says even if he doesn't get a medal, his presence will help raise awareness about the strength and plight of disabled people in Afghanistan.
The Olympic torch arrived in London this week, ahead of the opening ceremony on Friday. One man who carried the torch part of the way was BBC producer Stuart Hughes who lost his lower leg in 2003 while covering the war in Iraq.
Stem cells are often touted as potential treatments for conditions like spinal cord injury, diabetes, and Parkinson's disease. Two Indian doctors are already putting stem cells to use, curing some cases of blindness.