image: Using a scale to calibrate the crossbow to deliver a consistent force for spear tip experiments. This image relates to a paper that appeared in the Nov. 16, 2012, issue of Science, published by AAAS. The paper, by Jayne Wilkins at University of Toronto in Toronto, ON, Canada, and colleagues was titled, "Evidence for Early Hafted Hunting Technology." view more
Credit: Image courtesy of Jayne Wilkins