Sorry for this weird thread. Say that you throw a perfectly round 10 lb stone rock using a machine with constant force and distance of propulsion. Can a 10 lb ("average") human head,with full hair about 2 inches long, be thrown -using the same machine - just as far as the 10 lb rock? How about a 10 lb human head with a shaved head? Again, I apologize for these weird questions. It's just that I was arguing with someone and this topic came up. My position was that a human head is not really aerodynamically efficient, and will fall far short behind the perfectly round 10 lb rock.