conjoined which you see here we had -- had -- we had to split through the brain so one child had a hemi pleejia on the other side other side had one on the opposite side. interesting now nine nonts later both kids are moving both arms well. >> both of them had -- look at this look the video. there is new video of them -- of him you can see i think this is anighs. >> using his arm you said they were both using arms. >> correct. >> everything is working. >> everything is working. pretty amazing. >> how do you feel? >> it was an incredible experience being a part of this. and fortunately these two boys survived. and the parents of two healthy who should live a normal life. >> this is -- this is pretty technical. is this the biggest one of the biggest surgeries you've had to perform. >> certainly of my career. >> we've been through now seven