In our pilot episode of Lightbulb, we shine the light on a building material that's been around for centuries — concrete. Ripe for innovation, the #1 most-used building material is changing, not only with its composition but also in the places it's being used. Experts from Lithko Contracting, a concrete contractor, and Ozinga Bros., a ready-mix manufacturer, give us the scoop on what's new and improved in this age-old material.