C. R. "Chuck" Downing
shared:
8/15/2017 1:05:08 AM
Reply#SciFact Ounce for ounce, bone is stronger than steel & about four times as strong as concrete @SherryFrazier https://t.co/WK2guhYUC9
— C.R. Downing (@CRDowningAuthor) August 15, 2017