I only have a minute, but I just saw this and I thought it was cool.
I found this video at WideOpenSpaces. In it, Billy Berger, a primitive bow enthusiast, tests the penetration effectiveness of stone versus steel arrowheads. Turns out, they are every bit as effective as steel when shot into a freshly killed deer.
Apparently, there are some states that do not allow hunting with stone heads. As a primitive hunting enthusiast Mr. Berger wants to change this. The video was meant to provide support to his case.
(note from the 4:30 mark: The shooter is an idiot. No way I would shoot with a dog that close downrange. The test remains valid however.)