-- they beam it could have caused concussion-like symptoms. the mystery is what could cause a concussion without any physical trauma being involved.. the mystery is what could cause a concussion without any physical trauma being involved. there's no physical evidence to back it up. they feel they know what devices could be behind it. while this is still very much up in the air, it has had real affects. you have skeleton staff now here at the u.s. embassy in havana, all non-essential personnel, families have been sent home. if you are cuban, you can no longer get a visa here. if you want to visit family americans in u.s., if you are an american citizen like me, you couldn't get your passport renewed here. cuban diplomats have been expelled. it has a real impact on relations. >> and has had impact on the health of some of the diplomats and their families when they were brought back. thanks so much. i appreciate it. coming up for us, more