small font reads: Radioactivity. It’s been in the family for generations. In fact, scientists can tell us just how old our remote ancestors are by measuring the radioactivity still in the bones of prehistoric cave dwellers.
07
28
28
small font reads: Radioactivity. It’s been in the family for generations. In fact, scientists can tell us just how old our remote ancestors are by measuring the radioactivity still in the bones of prehistoric cave dwellers.
