nacho (47)in #science • 8 years ago • NoneConcrete lighter than WaterYesterday, I received word that my research grant for "Minimizing Portland Cement in an Ultralightweight Concrete…nacho (47)in #introduceyourself • 8 years ago • NoneMy name is Andy RobertsWho am I? I'm a recovering facebooker. I was in undergrad when I joined in 2006(?) and quit after the post-US…
