Assertion: mastodon's bone | /r/HasProperty | shaped into weapon
Facets:
value: by humans
type: OTHER
Source sentences:
text: Now on page 351 of this issue, researchers led by Michael Waters of Texas A&M University in College Station use DNA and radiocarbon dating to demonstrate that the point came from a mastodon bone shaped into a weapon by humans and used a startling 13,800 years ago.