HumansAncient 'computer' may have used bejewelled rings to model the cosmos The 2000-year-old Antikythera mechanism, a bronze device that displayed the motion of the sun, moon and planets, may have used rings with gems to represent celestial bodies News
HumansStone Age Europeans used human bones to make arrowheads Barbed bone points that washed up on the shores of Europe were used as arrowheads or spear tips, and some were made of human bones News