WASHINGTON, April 28, 2015 — Science fans, assemble! On May 1, the world's top superhero team is back to save the day in "Avengers: Age of Ultron." This week, Reactions looks at the chemistry behind these iconic heroes' gear and superpowers, including Tony Stark's suit, Captain America's shield and more. Check out the video here: https://youtu.be/Gr3ov7R89Xo.

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