VIDEO : Mark Ruffalo Shares Love For 'Science Bro' Robert Downey Jr.

It looks like nothing can get between the Marvel Cinematic Universe's fan-favorite Science Brothers. Mark Ruffalo, who plays Bruce Banner a.k.a the Hulk, took to Twitter to share a photo of him and Robert Downey Jr, who portrays Iron Man. The post is a tongue in cheek response to Downey Jr.'s earlier Facebook post in which he said he felt betrayed by Ruffalo getting a cheek kiss from a sea lion.