A long series of comments about cracking at our LinkedIn discussion group was interrupted recently by a fellow trying to sell Kalmatron, an admixture he claims increases concrete strength and improves just about every other property one can think of. This falls into the “you-never-know” category—but also into the “too-good-to-be-true” category. The company claims this is a “cement hydration agitator” that eliminates shrinkage, etc. The inventor has pushed this material all across our social media platforms, to the dismay of many of our regular contributors. You can check it out yourself at www.kalmatron.com or you can just move on to a new discussion.