This is your feel-good video of the week, which I found at Oregon Expat.
Note from the OP: "Many of you have pointed out that Derby's prosthetics seem too low. We
started this way to give him a chance to get used to his new legs. But
with 3D printing it's easy to iterate design, so he is being fitted with
progressively longer legs until he reaches his optimal height. Work is
ongoing and we are about to 3D print the 4th version of his prosthetics."