Robert Downey Jr. is about to melt your heart. The Iron Man actor recently visited Alex, a 7-year-old boy who was born with a partially developed right arm. He was about to receive a 3D-printed bionic arm from Albert Manero, a college student who builds and donates 3D-printed bionic limbs to children around the world. But, when Downey Jr. got wind of Manero's work through The Collective Project — and found out that Alex loves superheroes — he wanted to get involved. So, the actor delivered the arm to Alex himself. What's really amazing is RDJ didn't even break character for it. He pretended to be Tony Stark, a bionics expert, the whole way through. Take a look at how it all went down. It will make your heart feel feelings.
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