when she draws herself with her best friend -- >> she has the two hands? >> mm-hmm. >> how about you? >> no. >> no? you have -- >> the arm. >> the arm. >> reporter: a new arm with a motorized hand could cost tens to hundreds of thousands of dollars. out of reach for most. but when the piersons found a video online about alex, who got his bionic arm delivered by robert downey jr. >> do you know who that is? >> iron man. >> they wondered --