Chat with our AI personalities
I believe the German company Walter Tools made the first ones around 1950.
Homo habilis ("Handy man"), one of our distant predecessors was so named because of his use of primitive tools. Habilis existed between 2.4 and 1.5 million years ago.
I think it is the stones.
it really depends on how strong the solution is. if the solution is under 2 percent, you will have to emerse it for 20 minutes or longer. also, if you decide to throw in a couple of other tools to steralize while the first tools where still within the 20 minutes range, you will have to steralize the first tools for another 20.
They were small stones or pebbles - called calculus (pl = calculi).