SPEARHEADS

DEFINITION: The oldest known spearheads in North America have been found at a site that has already revealed many treasures. Archaeologists at Buttermilk Creek in Texas have uncovered the oldest known spearheads found in North America. The new “projectile points,” reported this week in the journal Science Advances, come in two unusual shapes — which adds to the evidence that the first people arrived in the Americas earlier than researchers thought.