Human thinking; spear tips (Introduction)

by David Turell , Saturday, November 17, 2012, 00:52 (4201 days ago) @ David Turell

Adding to the arrow heads, now spear tips from 500,000 years ago:-http://blogs.scientificamerican.com/observations/2012/11/15/human-ancestors-made-deadly-stone-tipped-spears-500000-years-ago/