What was the first major discovery by early humans?

If they did not discover water first they would not be able to live long enough to discover fire.

Mrs Honey Badger, Actually they needed to discover oxygen first to last long enough to look for the water

Mrs Honey Badger, Not considered a discovery.

Tom, we are still animals

Mrs Honey Badger, we discovered the others before fire, but we were animals then, not early humans.