After the 2010 earthquake in Haiti, the Red Cross sent text messages across the country with health tips, locations of aid and safety reminders. A similar system is being used in Sierra Leone to combat Ebola. International Federation of Red Cross and Red Crescent Societies hide caption

itoggle caption International Federation of Red Cross and Red Crescent Societies

A Muslim shopkeeper uses a mobile phone in front of his shop in the PK5 district of Bangui, the capital of the Central African Republic, on April 30. The nation, which struggles with conflict between Christian and Muslim militias, banned texting on Monday. Issouf Sanogo/AFP/Getty Images hide caption

itoggle caption Issouf Sanogo/AFP/Getty Images

Doctors used a type of MRI test to look at the blood vessels in the brain of a woman with dystextia. The test confirmed she was suffering from a stroke on the right side of her brain Archives of Neurology hide caption

itoggle caption Archives of Neurology