D
Deleted member 18477
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Iphone
Hundreds of years ago a scientist came up to me and asked me what I thought of ink, his new invention. I said the idea looked good on paper.
Probably writing.
It allowed society to plan itself around the principle of the division of labour and for agricultural surpluses to be produced and distributed / traded. And for different social classes to develop, in particular a non-productive class that could wage war and expand the territory occupied by a particular social group.
fire is also pretty useful
Probably writing.
It allowed society to plan itself around the principle of the division of labour and for agricultural surpluses to be produced and distributed / traded. And for different social classes to develop, in particular a non-productive class that could wage war and expand the territory occupied by a particular social group.
currency has always been around in some form...
I would go with the wheel
Schoolboy mistake... For a wheel to have value you need a hole in the centre, so man's greatest invention must be the "hole".
The wheel wasn't a particularly life changing invention for many years. No transport or farming equipment could go faster than a horse for thousands of years anyway.