Comment Re:What tools? (Score 1) 258
I'm struggling here to think of a primitive tool with handed-ness built into it. Anyone?
Not exactly primitive but everything in ancient Roman and Greek culture was built around everyone being right handed. Even the language reflected the value of being right handed compared to being left handed. They would slap students' left hands, even the great Caesars, to get them to learn to be right hand dominant.
The Latin (Roman) word for 'right' was 'dexter'. It's where we get the words dexterity, dextrous, and ambidextrous from. So in English someone being 'ambidextrous' means that they have two right hands. And the Latin word for 'left' was 'sinistra'. Which is where we get the words sinister and ambisinister. So someone who is ambisinistrous is someone with two left hands is considered unskilled manually.
In primitive cultures you'd see hand dominance as well. It was innate and the culture was designed around right handed dominance. While technically the tools that they used could be done with either hand, the information how to use those tools were passed down by demonstration, and the demonstrations were usually done by a right handed person. So a human from thousands of years ago hunting with spears and rocks would always throw those weapons with his right hand, and show his son to do it with the right hand, and so on. Sure those rocks aren't designed to be thrown with a specific hand but our natural tendency to be right handed influenced our primitive ancestors to continually practice right hand dominance.