Not sure if it blew my mind...I guess because I expected it...but the Samurai were biologically different from their peasant / artisan counterparts.

This was also the case with the warrior classes in other cultures.

The "knights" were literally BUILT different. They were genetically bred for war and battle. They were larger, stronger and more able to take life.

Over the centuries though, bloodlines were mixed. This is both good and bad. Bad because we don't have distinct classes as much anymore. Good because some of us carry the blood of warriors in us, along with other strains (builder, artisan, etc).

This is what gave rise to the "entrepreneur" IMO