The first American invention: How Clovis people made fluted arrow tips Adding fluting to stone tips is tricky and can easily backfire, creating weaker tips rather than stronger ones if done wrong.

A spear tip stuck in the rib of a mastodon is the oldest bone weapon in America, a new study says. It’s roughly 13,900 years old.

A spear tip stuck in the rib of a mastodon is the oldest bone weapon in America, a new study says. It’s roughly 13,900 years old.