WASHINGTON, March 1, 2016 — The sensation may be all too familiar—the intense, sharp pain in your foot caused by an unassuming LEGO® brick. Why does this tiny chunk of plastic cause so much pain? To answer this question, Reactions examines why we feel pain in the first place, as well as the material chemistry of LEGO® bricks. You may want to put on some slippers before stepping into this video: https://youtu.be/7HpE7oA-Fw8.