Concrete is all around us. It makes up the buildings we live in, the sidewalks we walk on, the ramps we do our sick skateboard tricks on … but how is it made? How does it go from a thick, sludgy paste into a hard, smooth surface? We asked engineering professor Matthew Adams to help us find the answer.

Got a question that seems to keep getting harder? Send it to us at BrainsOn.org/contact, and we’ll use all our ce-MENTAL ability to find the answer!