Ear plugs, they weren't alone in those caves. Can you imagine the acoustics? How come you never bring home dinosaur steaks like ZOG? his wife isn't wearing a 3 year old bear skin, OH no that wheel thing will never work
I think the first invention was a hand held grinding tool used to grind roots and nuts into a paste that could be fed to 3 or 4 year olds to get them completely weaned because the next baby was coming. That meant the 3-4-year-old needed to be eating solid food. Grinding raw food into something they could digest would require a specialized, portable grinding tool.