Fig 5. Tools and samples used in experimental study.
Items include bow and chert drill, the drilled carapace (Drill Holes 5 and 6), river pebbles, and river cane.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.