Greatest progress of any time period is what ?

the greatest advancement humanity has ever accomplished is sustaining our need for purpose.... either by science(as to blasting out in space in search of the remnants of the big bang) or by religion(as to evolving from paganism & polytheism to one-God in our search for significance).. They may seem futile to some, but judging the course of human history.... We've come far for a short period of time.

but with that comes the greatest challege.. to keep on progressing & never to regress... coz progress always comes with a huge price, What could be at stake?

Therefore 0 does not work.

We must in youre anaology of life go back before the age of "stone and " reasoning?

The greatest progresses of any time period would be the creation of time itself... Because without that, there wouldn't be time to begin with...

Ancient greek philosophers...... self awareness, our being and soul or lack there of, finding out the meaning behind this existance, discovering what true humanity is.... asking why

The sinking of the hyoid bone that made complex speech possible.

When man first learned to create fire. This is the start of man creating is own reality.

For me it is the time of the ancient Greeks.

When we have concept about time period in our mind.

When the non-physical sphere meets up with the physical sphere in the very same sphere...

I agree.