on saturday, the 31st president sur passioned jimmy carter, several months younger than the elder bush. >>> a volcano on the dmieshian island of bali, erupted this weekend. the eruptions temporarily disrupted some international flierts to the popular tourist destination and left nearby villages covered in a thin layer of ash. >>> up next, a 60 minutes preview in the war zone, a chicago surgeon risks his life to save victims of syrian civil war. >> quijano: syria's long ru running civil war has killed many medical professionals. on tonight's 60 minutes, scott pelley accompanies a chicago-based doctor on his fourth trip to the war zone. >> pelley: emergency medicine has better than driven underground. every air strike delivers too many patients with too little time. doctors improvise with scavenged drugs, and improvised instruments. veterinarians and dentists are brought in. >> dr. samar attar is a leading orthopedic surgeon from chicago who volunteers in syria's makeshift hospitals. >> the bombs would land so closely they would knock you off your feet and at times they would directly hi