The paper does not appear to distinguish between 'darts' used with atlatl throwing sticks, and arrows used with bows. Darts were used before bows.
(projectile point design is difficult; you can't haft archaic and yeet it too)
(projectile point design is difficult; you can't haft archaic and yeet it too)
HN has been overrun with puns and attempts at humour in the past few years, while substantive comments have declined imho. But that's just the way it is.